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垂心の作る逆中点三角形
Author:
Bunryu Kamimura
Topic:
Circle
,
Orthocenter
DH=EH=FHで各円の直径
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standingwave-reflection-free
standingwave-reflection-fixed
standingwave-plus
平均変化率
正17角形 作図 regular 17-gon
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棒の倒れ方長さ変更可 How to fall down a stick
「四角形のしきつめ」から面積を求める
楕円の極と極線
点の存在範囲
p75 例7
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Equations
Trigonometry
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