【中学受験算数】平面図形 正方形内の三角形の面積 面白い問題【最難関クラス/偏差値up】
Synopsis
正方形・長方形・平行四辺形内に一点を取り各頂点と結んで三角形を作ると向かい合う三角形の面積の和は全体の四角形の半分に ...
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