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底面周長:9.42÷3=3.14(釐米),底面半徑:3.14÷3.14÷2=0.5(釐米);3.14×0.52×2+9.42,=1.57+9.42,=10.99(平方釐米);答:它的底面半徑是0.5釐米,表面積是10.99平方釐米.故答案為:0.5;10.99.
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