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351　正多角形に現れる相似な三角形

Author:久保塾　今治

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正１７角形　作図　regular 17-gon 2
目で見る立方体の2等分
standingwave-plus
接点の作る円は内接円
standingwave-reflection

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seemingly irregular but regular
三平方の定理（ピタゴラス）のコピー
三角錐01
割合のイメージ
放物線の平行移動

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Algebra
Vectors
Multiplication
Arithmetic Operations
Conic Sections

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