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四角形の各辺の中点を結ぶと？
Author:
小山英憲
GeoGebra
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等積変形2
平均変化率
standingwave
円の伸開線
対数螺旋
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回転移動の様子
算数の基礎
P.69 応用例題1
（使用）中一断面図p197
数Ⅰp.87応用例題3
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Area
Right Triangles
Plane Figures or Shapes
Quadratic Equations
Optimization Problems