Mathematics
Junior High
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これ答えL＝πr＋2rなんですけど、解説してくださる方いませんか？🙇♀️🙇♀️
3 半径がr cm の半円の周の長さをlcmとするとき、
息をr, rを使って表しなさい。
**y cm
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ありがとうございます！🙇🏻♀️