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円周角の定理

Author:井上直紀

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等積変形2
目で見る立方体の2等分
円の伸開線
接点の作る円は内接円
standingwave-reflection

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点の存在範囲（3Dボタン式-残像）
射的
三角柱の投影図
変化の割合
中1_空間図形_面の移動

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Cosine
Division
Curve Sketching
General Quadrilateral
Reflection

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