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三角形の傍心（excenters）
Author:
Takayuki Kamei
GeoGebra
New Resources
等積変形2
standingwave-reflection-free
sine-wave
正１７角形 作図 regular 17-gon 2
二次曲線と離心率
Discover Resources
ラムゼーの問題
円周角の定理の楕円への拡張の試み
二次関数(復習)
占い
about canvas
Discover Topics
Cosine
Combinatorics
Ratios
Symmetry
Real Numbers