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重要公式
円錐の表面積:πr(L-r)
円錐の側面の中心角:360÷L分のr
球の表面積:4πr³
球の体積:3分の4πr²

解答
18
⑴119π
⑵252
19
⑴140
⑵72π
⑶15
⑷324
20
⑴2:3
⑵1:20

ゲスト 辞めた

ありがとうございます!💖

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