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由c=2*圓周率*r,d=2r,得: r=c/2圓周率 =28.26/(2*3.14) =28.26/6.28 =4.5(釐米) d=2r =2*4.5 =9(釐米) 答:它的半徑是4.5釐米,直徑是9釐米.
28.26除以3.14,直徑是9,半徑是4.5
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