【中学２年数学/三角形と四角形】132 正三角形の応用問題④ ～２年生からできる受験・入試対策～
Synopsis
中学2年生で学習する、正三角形の性質を使った証明問題と、角度を求める問題です。気をつけてほしいのは、三角形ACDは正 ...
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