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円周角決定版
Author:
伊藤秀雄
GeoGebra
New Resources
standingwave-reflection-fixed
standingwave-reflection
アステロイド
standingwave
円の伸開線
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頂点の重心（平均）と多角形の重心
三垂線
接線 問1
正四面体に含まれる正八面体
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Tangent Function
Diagrams
Symmetry
Subtraction
Optimization Problems