[数学a14三角形の外心・内心・重心]三角形にある有名な三つの中心！よく出てくるので覚えておきましょう！
Synopsis
ヤソニキチャンネルを見ていただきありがとうござい 勉強はしたくないけど、しないといけないという子が多いと思います。
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