一个圆的周长,直径,和半径的和是9.28厘米,面积多少平方厘米,半径多少厘米?
人气：425 ℃ 时间：2019-10-08 13:16:54
解答
设半径为X,X+2X+π2X=9.28
求X=1 半径为1厘米
面积为π*r^2=3.14平方厘米
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