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底面周長是 188.4÷2=94.2(釐米) 底面半徑是 94.2÷3.14÷2=15(釐米) 底面積是 15×15×3.14=706.5(平方釐米) 側面積是 94.2×15=1413(平方釐米) 表面積是 706.5×2+1413=2826(平方釐米)
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