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相似確認（三角形）
Author:
Tsuyoshi Yamamoto
Topic:
Triangles
GeoGebra
New Resources
対数螺旋
standingwave-plus
standingwave-reflection
接点の作る円は内接円
斜めドップラー
Discover Resources
完全数
Fourie_01
三角形の外心内心垂心重心
円の接線と接点
東大2017理系5
Discover Topics
Derivative
Numbers
Exponent
Integers
Translation