【中学受験算数】平面図形・長さを求める・必要なものは？【最難関クラス・偏差値up】
Synopsis
図形の形だけなら、おなじみの奴です。星型図形の角度の問題は、外角に関する定理（通称スリッパ）等を利用して角度を集めて ...
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