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垂心の存在の証明
Author:
Tetsuya Akazawa
GeoGebra
New Resources
standingwave-reflection-fixed
正１７角形 作図 regular 17-gon
接点の作る円は内接円
standingwave-reflection-free
正１７角形 作図 regular 17-gon 2
Discover Resources
へこみのある図形（五角形）
Hypotrochoid
ミケルの定理（直線と円）
直交行列の積は直交行列
円周角の定理
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Complex Numbers
Tangent Function
Constructions
Similar Triangles
Vectors