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小５　平行四辺形の面積

Author:kageyama

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standingwave-reflection-free
対数螺旋
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デザイン定規
区分求積法（上方和と下方和）
円の伸開線ver3
画面固定点
円周角と中心角

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Equilateral Triangles
Isosceles Triangles
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Similar Triangles
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