おうぎ形の中心角の求め方

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http://youtube.com/watch?v=9qQtVZqSusw

中学数学 • 最後の類題で、動画が途切れていたのでここに書いておきます。 • （類題）半径６cm、面積４π cm2 • 面積は6×6×π=36π • よって • 4π/36π=1/9 • となり • おうぎ形の中心角は • 360°×1/9=40° • 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