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三角形の垂心（an orthocenter）

Author:Takayuki Kamei

Topic:Orthocenter

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対数螺旋
standingwave-reflection-fixed
standingwave-reflection
アステロイド
正１７角形　作図　regular 17-gon 2

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mebius
The sum of the arithmetic progression
直線上を転がる円
７角形の外角の和
三平方の定理　証明②（２つ同時変形ver）

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Complex Numbers
Solids or 3D Shapes
Reflection
Correlation
Logarithm

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