If we cut the circle into a rectangle,it perimeter will add up 6cm,can you work out area of circle?
问题描述：
If we cut the circle into a rectangle,it perimeter will add up 6cm,can you work out area of circle?
答
如果把一个圆剪成一个长方形,它的周长增加了6厘米,你能算出圆的面积吗?