Answers

(式)4/3 × π × 2 × 2 × 2 = 1/6 π
1/6 π × 1/2 = 1/12 π
2 × 2 × π × 3 = 12 π
2 × 2 × π × 3 × 1/3 = 4 π
12π-4π=8π

A. 1/12 π + 8 π

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