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Home » \( r \) 是半径，给定为 10 cm。 - Dachbleche24

\( r \) 是半径，给定为 10 cm。 - Dachbleche24

📅 March 9, 2026 👤 scraface

Mar 09, 2026

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\( S_{20} = \frac{20}{2} (2 \times 5 + 19 \times 3) = 10 (10 + 57) = 1...
A sphere has a surface area of 314 square centimeters. Find its radius...
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\( 4\pi r^2 = 314 \),
\( r^2 = \frac{314}{4\pi} = \frac{314}{12.5664} \approx 25 \),
\( r = \sqrt{25} = 5 \) cm.
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