yi ge 4 fen zhi 1 de yuan zhouzhang shi 14.28,mianji shi duo shao

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yi ge 4 fen zhi 1 de yuan zhouzhang shi 14.28,mianji shi duo shao

无敌了,全是拼音.
设半径为R,周长=2R+(2πR)/4=14.28
R =4,所以半径为4
面积应该为一个完整圆的1/4,为πR*R/4=3.14*4*4/4=12.56

设半径为R,周长=2R+(2πR)/4=14.28
R =4,所以半径为4
面积应该为一个完整圆的1/4,为πR*R/4=3.14*4*4/4=12.56

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