å¹³é¢ã«ããã¦ãä¸ããããç´ç·ã¨ãä¸ããããç¹ããç´ç·ã¸ä¸ãããåç·ã¨ã®äº¤ç¹ãè¨ç®ããå ¬å¼ããã¯ãã«ãç¨ããã â» MathJax ã使ç¨ãã¦ãã¾ããæ°å¼ã表示ããããã«ã¯ãJavaScript ããªã³ã«ããå¿ è¦ãããã¾ãã ç´ç· $AB$ ã¨ç¹ $P$ ããã®åç·ã¨ã®äº¤ç¹ $H$ ãè¨ç®ããå ¬å¼ ç¹ $A$, $B$, $P$ ãä¸ãããã¦ãããã®ã¨ã, $A\neq B$ ã§ããã¨ãã. å ¬å¼ ã¾ã, $$ t = \frac{\overrightarrow{AB}\cdot\overrightarrow{AP}}{\lvert\overrightarrow{AB}\rvert^{2}} $$ ã¨ãã. ç¹ $H$ ã, ä½ç½®ãã¯ãã« $\overrightarrow{OH}$ ã $$ \overrightarrow{OH} = \overrightarrow{OA} + t\over
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