【中学受験算数】平面図形 長方形の中に直角二等辺三角形が4つ【基本問題の確認】
Synopsis
まずはわかる長さの書き込みと条件をどう使うかを考えていきましょう。真ん中の斜線部分の面積の形を考えれば面積も簡単に ...
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