小学六年级上册数学课后练习题
解决问题。(30分)
1、一个圆形的铁环，直径是40厘米，做这样一个铁环需要用多长的铁条?
2、在一个圆形水池的周围有一圈圆形的围栏，已知水池的半径是5m，围栏至少有多长?
3、从一张长40dm，宽15dm的长方形纸中，最多能剪出多少直径3dm的圆?
4、在长10cm，宽8cm的长方形中剪下一个最大的`圆，这个圆的半径是多少cm?周长是多少cm?
5、沙子堆在地面上占地正好是圆形，量出它一周的长度是15.7m，那么沙子堆的直径是多少m?
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