A circle is a simple shape in Euclidean geometry. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The distance between any of the points and the centre is called the radius.
A circle is a simple closed curve which divides the plane into two regions: an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure, or to the whole figure including its interior; in strict technical usage, the circle is only the boundary and the whole figure is called a disk.
A circle may also be defined as a special ellipse in which the two foci are coincident and the eccentricity is 0, or the two-dimensional shape enclosing the most area per unit perimeter squared, using calculus of variations.
Circles was a feminist film and video distribution network in the UK, which was set up out of a desire to distribute and screen women's films on their own terms. It was founded in 1979 by feminist filmmakers Lis Rhodes, Jo Davis, Felicity Sparrow and Annabel Nicolson, publishing a 1980 catalogue including about 30 films, and it closed in 1991, largely due to funding issues that also prompted the merger of Circles and Cinema of Women, which led to the formation of Cinenova. A previous funding crisis in 1987, when funding by Tower Hamlets council had been withdrawn, had been resolved with replacement funding from the British Film Institute.
Origins
According to Jenny Holland and Jane Harris, "Circles started in 1979, partly as a response to an Arts Council of Great Britain exhibition on experimental film. Feeling that their work on women's involvement in this field was being marginalised, the women on the exhibition committee withdrew their painstakingly researched work and issued an explanatory statement. In many ways, this research was the cornerstone of Circles, which went on to distribute the films by Alice Guy, Germaine Dulac, Maya Deren, and Lois Weber which were to have been discussed in the exhibition." The statement, "Women and the Formal Film," was published in the "Film as Film" exhibition catalogue and acted as a manifesto for the distribution collective that emerged.
The Party Scene is the debut full-length studio album by American pop punk band All Time Low, released on July 19, 2005 via regional imprint Emerald Moon Records. Music videos were released for "Circles" and "The Girl's a Straight-Up Hustler". Tracks 2, 3, 8, 9 and 12 were re-recorded for the band's next EP, Put Up or Shut Up.
Track listing
All music and arrangements by All Time Low; except where noted. All lyrics by Alex Gaskarth. Additional arrangements by Paul Leavitt.
Sampler is a compilation album by the English rock band Cardiacs, released in 1995.
The album was intended as a budget introduction to the band's music, and was released as part of the general 1995 reissue of the Cardiacs back catalogue. Each track is taken from a different album in the reissue series. Most of the tracks are performed by Cardiacs, but the album also features two tracks performed by Cardiacs spin-off projects: The Sea Nymphs ("Christ Alive") and Tim Smith's Extra Special OceanLandWorld ("Veronica In Ecstasy"). Sampler features two of Cardiacs' singles/lead tracks - the charting version of "Is This The Life?" and a live version of the title track from the "Big Ship" mini-album.
A sampler is an electronic musical instrument similar in some respects to a synthesizer, but instead of generating sounds, it uses recordings (or "samples") of sounds that are loaded or recorded into it by the user. These sounds are then played back by means of the sampler program itself, a keyboard, sequencer or another triggering device to perform or compose music. Because these samples are now usually stored in digital memory, the information can be quickly accessed. A single sample may often be pitch-shifted to produce musical scales and chords.
Often samplers offer filters, modulation via low frequency oscillation and other synthesizer-like processes that allow the original sound to be modified in many different ways. Most samplers have polyphonic capabilities - they are able to play more than one note at the same time. Many are also multitimbral - they can play back different sounds simultaneously.
Historical overview
Prior to computer memory-based samplers, musicians used tape replay keyboards, which store recordings on analog tape. When a key is pressed the tape head contacts the moving tape and plays a sound. The Mellotron was the most notable model, used by a number of groups in the late 1960s and the 1970s, but such systems were expensive and heavy due to the multiple tape mechanisms involved, and the range of the instrument was limited to three octaves at the most. To change
sounds a new set of tapes had to be installed in the instrument. The emergence of the digital sampler made sampling far more practical.
7 HORNS 7 EYES - Throes of Absolution (Official Album Sampler - Basick Records)
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
_______________________________________________________________
"This takes progressive death metal to a new level of pulverizing grandeur. Love it!" - Dom Lawson - Metal Hammer
"Throes of Absolution is one of the first great metal albums of 2012." - GrumpyRocker
_______________________________________________________________
DOWNLOAD A FREE INSTRUMENTAL TRACK - 7 HORNS 7 EYES - Divine Amnesty (Instrumental - FREE DOWNLOAD) http://soundcloud.com/basickrecords/7-horns-7-eyes-divine-amnesty
Progressive atmospheric death metallers 7 HORNS 7 EYES will be releasing their debut full-length album, Throes Of Absolution, across Europe on April 23, 2012 via Basick Records.
Featuring a guest appearance ...
published: 12 Apr 2012
Bboy Mac Fleezy Sampler teaser video/Mooncricket Films 2012
Currently in production. We need more original beats and if you have any that you have made submit them to www.mooncricketfilms.com and then will be knocking out more dance videos for you. If you need a promo dance video you can also contact us Mooncricket Films site.
published: 05 Apr 2012
#golfswing #fyp #waitforit #followthrough
published: 11 Dec 2022
A perfect circle - Passive (Lyrics)
All the videos, songs, images, and graphics used in the video belong to their respective owners and I or this channel does not claim any right over them.
published: 19 Oct 2012
One Morning Tricking Sampler
Just a couple things i filmed practicing one morning.
Song: Clouds Are Gathering
Artist: Circles
DISCLAIMER: I do not own this song and am not using it for personal gain.
published: 28 Mar 2012
Making of "Break'n A Sweat "
Clips are taken from Re:Generation, if you wanna see the full movie, go here
www.hulu.com/regeneration
Visit us at http://www.SkrillexMothership.net
Like us on Facebook http://www.facebook.com/skrillexship
Follow us on twitter http://www.twitter.com/Skrillexship
published: 16 Mar 2012
OCE 1001 Lecture; The Ocean Floor
This Lecture is meant for students of OCE 1001 An Introduction to Oceanography at Valencia College and Seminole State College. The content is taken for the textbook Essentials of Oceanography, 8th Edition, from Cengage Learning, 2018 and written by Tom Garrison and Robert Ellis.
published: 01 Jan 2018
October 10, 2012 ORSSAB meeting
October 2012 ORSSAB Meeting
published: 15 Oct 2012
Kyle Skelly - MANIAC (2018) | Best of October Tricking
SUBSCRIBE FOR A GOOD TIME! ▸ http://smarturl.it/PlanZero
My best Tricking and Flips from this month of October 2018. Thought I'd make a compilation to see how far I've progressed this month. Training is going well, even though it's cold as teets right now.
GET THE NEW CLOTHING!
http://planzero.co
WANT TO LEARN THESE FLIPS ONLINE!?
https://www.kojostricklab.com/?wpam_id=23
FOLLOW THE MADNESS
Instagram ▸ https://instagram.com/kyleslyf
Facebook ▸ http://facebook.com/planzeroclothing
Snapchat ▸ kyleslyf
Music by https://www.youtube.com/watch?v=XEymPGxopmg
Outro Music by https://soundcloud.com/mudchuteofficial
GEAR THAT I USE
MY MAIN CAMERA — http://amzn.to/2ktv5ON
VLOG CAMERA — http://amzn.to/2kUUSA4
MAIN WIDE ANGLE LENS — http://amzn.to/2kttPeD
GOOD ZOOM LENS — http://amzn.to/2kV3dUz
CH...
published: 29 Oct 2018
VCE Maths Methods | Unit Circle
Revision videos for VCE Maths Methods Units 3&4. This series includes:
- Unit circle
- Differentiability
- Differentiation by first principle
- Finding the distance between two points
- Using the integral
- Sketching
- Finding the inverse of a function
- Product rule and quotient rule
- Exact values
- Mutually exclusive events and independent events
---
ATAR Notes is by students, for students. We work every day to make VCE a little easier. Check out some of our resources:
- Free VCE resources: https://atarnotes.com/vce-resources-atar-notes/
- VCE tutoring: https://tutesmart.com/
- VCE study guides: https://atarnotes.com/shop/
- Online access to VCE study guides: https://edunlimited.com/
---
Make sure to subscribe to @ATAR Notes - VCE for lots more free study videos.
Facebook: ATAR...
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
_______________________________________________________________
"Thi...
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
_______________________________________________________________
"This takes progressive death metal to a new level of pulverizing grandeur. Love it!" - Dom Lawson - Metal Hammer
"Throes of Absolution is one of the first great metal albums of 2012." - GrumpyRocker
_______________________________________________________________
DOWNLOAD A FREE INSTRUMENTAL TRACK - 7 HORNS 7 EYES - Divine Amnesty (Instrumental - FREE DOWNLOAD) http://soundcloud.com/basickrecords/7-horns-7-eyes-divine-amnesty
Progressive atmospheric death metallers 7 HORNS 7 EYES will be releasing their debut full-length album, Throes Of Absolution, across Europe on April 23, 2012 via Basick Records.
Featuring a guest appearance by Jeff Loomis (ex-Nevermore), the album has been produced and mixed by 7H7E's guitarist, Aaron Smith at his own Envisage Audio studio. Jens Bogren (Opeth, Amon Amarth) mastered the outing; guitars were re-amped by Andy Sneap (Megadeth, Killswitch Engage), whilst Travis Smith (Nevermore, Katatonia) crafted the artwork.
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
Press opportunities for 7 HORNS 7 EYES are available, so please contact [email protected] to schedule.
FIND OUT MORE ABOUT 7 HORNS 7 EYES
http://www.facebook.com/7horns7eyes
http://www.youtube.com/7horns7eyesOfficial
http://www.7horns7eyes.bigcartel.com/
http://basickrecords.bandcamp.com/album/convalescence-ep
http://www.basickrecords.com/bands/7_horns_7_eyes
Released by: BasickRecords
Release/catalogue number: BSK040CD
Release date: Apr 23, 2012
http://www.facebook.com/basickeurope
http://www.facebook.com/7horns7eyes
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
_______________________________________________________________
"This takes progressive death metal to a new level of pulverizing grandeur. Love it!" - Dom Lawson - Metal Hammer
"Throes of Absolution is one of the first great metal albums of 2012." - GrumpyRocker
_______________________________________________________________
DOWNLOAD A FREE INSTRUMENTAL TRACK - 7 HORNS 7 EYES - Divine Amnesty (Instrumental - FREE DOWNLOAD) http://soundcloud.com/basickrecords/7-horns-7-eyes-divine-amnesty
Progressive atmospheric death metallers 7 HORNS 7 EYES will be releasing their debut full-length album, Throes Of Absolution, across Europe on April 23, 2012 via Basick Records.
Featuring a guest appearance by Jeff Loomis (ex-Nevermore), the album has been produced and mixed by 7H7E's guitarist, Aaron Smith at his own Envisage Audio studio. Jens Bogren (Opeth, Amon Amarth) mastered the outing; guitars were re-amped by Andy Sneap (Megadeth, Killswitch Engage), whilst Travis Smith (Nevermore, Katatonia) crafted the artwork.
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
Press opportunities for 7 HORNS 7 EYES are available, so please contact [email protected] to schedule.
FIND OUT MORE ABOUT 7 HORNS 7 EYES
http://www.facebook.com/7horns7eyes
http://www.youtube.com/7horns7eyesOfficial
http://www.7horns7eyes.bigcartel.com/
http://basickrecords.bandcamp.com/album/convalescence-ep
http://www.basickrecords.com/bands/7_horns_7_eyes
Released by: BasickRecords
Release/catalogue number: BSK040CD
Release date: Apr 23, 2012
http://www.facebook.com/basickeurope
http://www.facebook.com/7horns7eyes
Currently in production. We need more original beats and if you have any that you have made submit them to www.mooncricketfilms.com and then will be knocking ou...
Currently in production. We need more original beats and if you have any that you have made submit them to www.mooncricketfilms.com and then will be knocking out more dance videos for you. If you need a promo dance video you can also contact us Mooncricket Films site.
Currently in production. We need more original beats and if you have any that you have made submit them to www.mooncricketfilms.com and then will be knocking out more dance videos for you. If you need a promo dance video you can also contact us Mooncricket Films site.
All the videos, songs, images, and graphics used in the video belong to their respective owners and I or this channel does not claim any right over them.
All the videos, songs, images, and graphics used in the video belong to their respective owners and I or this channel does not claim any right over them.
All the videos, songs, images, and graphics used in the video belong to their respective owners and I or this channel does not claim any right over them.
Just a couple things i filmed practicing one morning.
Song: Clouds Are Gathering
Artist: Circles
DISCLAIMER: I do not own this song and am not using it for p...
Just a couple things i filmed practicing one morning.
Song: Clouds Are Gathering
Artist: Circles
DISCLAIMER: I do not own this song and am not using it for personal gain.
Just a couple things i filmed practicing one morning.
Song: Clouds Are Gathering
Artist: Circles
DISCLAIMER: I do not own this song and am not using it for personal gain.
Clips are taken from Re:Generation, if you wanna see the full movie, go here
www.hulu.com/regeneration
Visit us at http://www.SkrillexMothership.net
Like us on...
Clips are taken from Re:Generation, if you wanna see the full movie, go here
www.hulu.com/regeneration
Visit us at http://www.SkrillexMothership.net
Like us on Facebook http://www.facebook.com/skrillexship
Follow us on twitter http://www.twitter.com/Skrillexship
Clips are taken from Re:Generation, if you wanna see the full movie, go here
www.hulu.com/regeneration
Visit us at http://www.SkrillexMothership.net
Like us on Facebook http://www.facebook.com/skrillexship
Follow us on twitter http://www.twitter.com/Skrillexship
This Lecture is meant for students of OCE 1001 An Introduction to Oceanography at Valencia College and Seminole State College. The content is taken for the text...
This Lecture is meant for students of OCE 1001 An Introduction to Oceanography at Valencia College and Seminole State College. The content is taken for the textbook Essentials of Oceanography, 8th Edition, from Cengage Learning, 2018 and written by Tom Garrison and Robert Ellis.
This Lecture is meant for students of OCE 1001 An Introduction to Oceanography at Valencia College and Seminole State College. The content is taken for the textbook Essentials of Oceanography, 8th Edition, from Cengage Learning, 2018 and written by Tom Garrison and Robert Ellis.
SUBSCRIBE FOR A GOOD TIME! ▸ http://smarturl.it/PlanZero
My best Tricking and Flips from this month of October 2018. Thought I'd make a compilation to see how f...
SUBSCRIBE FOR A GOOD TIME! ▸ http://smarturl.it/PlanZero
My best Tricking and Flips from this month of October 2018. Thought I'd make a compilation to see how far I've progressed this month. Training is going well, even though it's cold as teets right now.
GET THE NEW CLOTHING!
http://planzero.co
WANT TO LEARN THESE FLIPS ONLINE!?
https://www.kojostricklab.com/?wpam_id=23
FOLLOW THE MADNESS
Instagram ▸ https://instagram.com/kyleslyf
Facebook ▸ http://facebook.com/planzeroclothing
Snapchat ▸ kyleslyf
Music by https://www.youtube.com/watch?v=XEymPGxopmg
Outro Music by https://soundcloud.com/mudchuteofficial
GEAR THAT I USE
MY MAIN CAMERA — http://amzn.to/2ktv5ON
VLOG CAMERA — http://amzn.to/2kUUSA4
MAIN WIDE ANGLE LENS — http://amzn.to/2kttPeD
GOOD ZOOM LENS — http://amzn.to/2kV3dUz
CHEAP BUT GOOD LENS — http://amzn.to/2kUYhiB
LENS ADAPTOR — http://amzn.to/2kUVupm
MICROPHONE — http://amzn.to/2qa8Axw
LAPTOP I EDIT WITH — http://amzn.to/2kUS2uQ
SUBSCRIBE FOR A GOOD TIME! ▸ http://smarturl.it/PlanZero
My best Tricking and Flips from this month of October 2018. Thought I'd make a compilation to see how far I've progressed this month. Training is going well, even though it's cold as teets right now.
GET THE NEW CLOTHING!
http://planzero.co
WANT TO LEARN THESE FLIPS ONLINE!?
https://www.kojostricklab.com/?wpam_id=23
FOLLOW THE MADNESS
Instagram ▸ https://instagram.com/kyleslyf
Facebook ▸ http://facebook.com/planzeroclothing
Snapchat ▸ kyleslyf
Music by https://www.youtube.com/watch?v=XEymPGxopmg
Outro Music by https://soundcloud.com/mudchuteofficial
GEAR THAT I USE
MY MAIN CAMERA — http://amzn.to/2ktv5ON
VLOG CAMERA — http://amzn.to/2kUUSA4
MAIN WIDE ANGLE LENS — http://amzn.to/2kttPeD
GOOD ZOOM LENS — http://amzn.to/2kV3dUz
CHEAP BUT GOOD LENS — http://amzn.to/2kUYhiB
LENS ADAPTOR — http://amzn.to/2kUVupm
MICROPHONE — http://amzn.to/2qa8Axw
LAPTOP I EDIT WITH — http://amzn.to/2kUS2uQ
Revision videos for VCE Maths Methods Units 3&4. This series includes:
- Unit circle
- Differentiability
- Differentiation by first principle
- Finding the dis...
Revision videos for VCE Maths Methods Units 3&4. This series includes:
- Unit circle
- Differentiability
- Differentiation by first principle
- Finding the distance between two points
- Using the integral
- Sketching
- Finding the inverse of a function
- Product rule and quotient rule
- Exact values
- Mutually exclusive events and independent events
---
ATAR Notes is by students, for students. We work every day to make VCE a little easier. Check out some of our resources:
- Free VCE resources: https://atarnotes.com/vce-resources-atar-notes/
- VCE tutoring: https://tutesmart.com/
- VCE study guides: https://atarnotes.com/shop/
- Online access to VCE study guides: https://edunlimited.com/
---
Make sure to subscribe to @ATAR Notes - VCE for lots more free study videos.
Facebook: ATAR Notes - VCE
Instagram: atarnotes_vce
Contact: [email protected]
Revision videos for VCE Maths Methods Units 3&4. This series includes:
- Unit circle
- Differentiability
- Differentiation by first principle
- Finding the distance between two points
- Using the integral
- Sketching
- Finding the inverse of a function
- Product rule and quotient rule
- Exact values
- Mutually exclusive events and independent events
---
ATAR Notes is by students, for students. We work every day to make VCE a little easier. Check out some of our resources:
- Free VCE resources: https://atarnotes.com/vce-resources-atar-notes/
- VCE tutoring: https://tutesmart.com/
- VCE study guides: https://atarnotes.com/shop/
- Online access to VCE study guides: https://edunlimited.com/
---
Make sure to subscribe to @ATAR Notes - VCE for lots more free study videos.
Facebook: ATAR Notes - VCE
Instagram: atarnotes_vce
Contact: [email protected]
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
_______________________________________________________________
"This takes progressive death metal to a new level of pulverizing grandeur. Love it!" - Dom Lawson - Metal Hammer
"Throes of Absolution is one of the first great metal albums of 2012." - GrumpyRocker
_______________________________________________________________
DOWNLOAD A FREE INSTRUMENTAL TRACK - 7 HORNS 7 EYES - Divine Amnesty (Instrumental - FREE DOWNLOAD) http://soundcloud.com/basickrecords/7-horns-7-eyes-divine-amnesty
Progressive atmospheric death metallers 7 HORNS 7 EYES will be releasing their debut full-length album, Throes Of Absolution, across Europe on April 23, 2012 via Basick Records.
Featuring a guest appearance by Jeff Loomis (ex-Nevermore), the album has been produced and mixed by 7H7E's guitarist, Aaron Smith at his own Envisage Audio studio. Jens Bogren (Opeth, Amon Amarth) mastered the outing; guitars were re-amped by Andy Sneap (Megadeth, Killswitch Engage), whilst Travis Smith (Nevermore, Katatonia) crafted the artwork.
http://store.basickrecords.com/product/7-horns-7-eyes-throes-of-absolution-cd BUY THE CD
Press opportunities for 7 HORNS 7 EYES are available, so please contact [email protected] to schedule.
FIND OUT MORE ABOUT 7 HORNS 7 EYES
http://www.facebook.com/7horns7eyes
http://www.youtube.com/7horns7eyesOfficial
http://www.7horns7eyes.bigcartel.com/
http://basickrecords.bandcamp.com/album/convalescence-ep
http://www.basickrecords.com/bands/7_horns_7_eyes
Released by: BasickRecords
Release/catalogue number: BSK040CD
Release date: Apr 23, 2012
http://www.facebook.com/basickeurope
http://www.facebook.com/7horns7eyes
Currently in production. We need more original beats and if you have any that you have made submit them to www.mooncricketfilms.com and then will be knocking out more dance videos for you. If you need a promo dance video you can also contact us Mooncricket Films site.
All the videos, songs, images, and graphics used in the video belong to their respective owners and I or this channel does not claim any right over them.
Just a couple things i filmed practicing one morning.
Song: Clouds Are Gathering
Artist: Circles
DISCLAIMER: I do not own this song and am not using it for personal gain.
Clips are taken from Re:Generation, if you wanna see the full movie, go here
www.hulu.com/regeneration
Visit us at http://www.SkrillexMothership.net
Like us on Facebook http://www.facebook.com/skrillexship
Follow us on twitter http://www.twitter.com/Skrillexship
This Lecture is meant for students of OCE 1001 An Introduction to Oceanography at Valencia College and Seminole State College. The content is taken for the textbook Essentials of Oceanography, 8th Edition, from Cengage Learning, 2018 and written by Tom Garrison and Robert Ellis.
SUBSCRIBE FOR A GOOD TIME! ▸ http://smarturl.it/PlanZero
My best Tricking and Flips from this month of October 2018. Thought I'd make a compilation to see how far I've progressed this month. Training is going well, even though it's cold as teets right now.
GET THE NEW CLOTHING!
http://planzero.co
WANT TO LEARN THESE FLIPS ONLINE!?
https://www.kojostricklab.com/?wpam_id=23
FOLLOW THE MADNESS
Instagram ▸ https://instagram.com/kyleslyf
Facebook ▸ http://facebook.com/planzeroclothing
Snapchat ▸ kyleslyf
Music by https://www.youtube.com/watch?v=XEymPGxopmg
Outro Music by https://soundcloud.com/mudchuteofficial
GEAR THAT I USE
MY MAIN CAMERA — http://amzn.to/2ktv5ON
VLOG CAMERA — http://amzn.to/2kUUSA4
MAIN WIDE ANGLE LENS — http://amzn.to/2kttPeD
GOOD ZOOM LENS — http://amzn.to/2kV3dUz
CHEAP BUT GOOD LENS — http://amzn.to/2kUYhiB
LENS ADAPTOR — http://amzn.to/2kUVupm
MICROPHONE — http://amzn.to/2qa8Axw
LAPTOP I EDIT WITH — http://amzn.to/2kUS2uQ
Revision videos for VCE Maths Methods Units 3&4. This series includes:
- Unit circle
- Differentiability
- Differentiation by first principle
- Finding the distance between two points
- Using the integral
- Sketching
- Finding the inverse of a function
- Product rule and quotient rule
- Exact values
- Mutually exclusive events and independent events
---
ATAR Notes is by students, for students. We work every day to make VCE a little easier. Check out some of our resources:
- Free VCE resources: https://atarnotes.com/vce-resources-atar-notes/
- VCE tutoring: https://tutesmart.com/
- VCE study guides: https://atarnotes.com/shop/
- Online access to VCE study guides: https://edunlimited.com/
---
Make sure to subscribe to @ATAR Notes - VCE for lots more free study videos.
Facebook: ATAR Notes - VCE
Instagram: atarnotes_vce
Contact: [email protected]
A circle is a simple shape in Euclidean geometry. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The distance between any of the points and the centre is called the radius.
A circle is a simple closed curve which divides the plane into two regions: an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure, or to the whole figure including its interior; in strict technical usage, the circle is only the boundary and the whole figure is called a disk.
A circle may also be defined as a special ellipse in which the two foci are coincident and the eccentricity is 0, or the two-dimensional shape enclosing the most area per unit perimeter squared, using calculus of variations.