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等角共役点の作る外接三角形と内接三角形の相似
Author:
Bunryu Kamimura
Topic:
Circle
,
Constructions
,
Intersection
,
Similar Triangles
,
Triangles
Dを動かしてみましょう。DとKが重なったところが内心。左上の相似は、内接四角形の定理で証明できるはず。
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