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9点円と傍接円
Author:
Bunryu Kamimura
Topic:
Circle
,
Triangles
九点円は傍接円と内接円の両方に接しています。
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M_iwate_2018_01
answer Applet to miyamath84's "円と直線の位置関係"
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Incircle or Inscribed Circle
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