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31.4÷5=6.28------底面周長 6.28÷3.14÷2=1----底面半徑 6.28*20=125.6平方釐米---側面積 3.14*1*1*2=6.28----兩底面的面積 表面積:125.6+6.28=131.88(平方釐米)
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