Mathematics
Junior High
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✨ Best Answer ✨

体積
半径3cmの半球と円柱の合計
4/3☓3^3π/2+π3^2☓2=18π+18π=36π
表面積
4π3^2/2(半球)+2☓3π☓2(円柱の側面)+π3^2(底)=18π+12π+9π=39π かな?

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