压路机的滚筒是一个圆柱

  • 时间:2020-05-23 15:41:47
  • 分类:数学世界
  • 阅读:156 次

压路机问题:压路机的滚筒是一个圆柱,它的宽为2米,半径为0.5米,压路机向前滚动100周,压过的路面有多大?

本题由资优网老师数学题解答:压路机的滚筒是圆柱形,滚筒与地面相接触的是它的侧面,所以算压过的路面有多大,需要先算出圆柱的侧面积,再乘100(因为它滚了100周,所以是侧面积的100倍)。

滚筒的侧面积=底面周长×高,算式如下:

3.14×0.5×2 × 2 = 6.28(平方米)

压过的路面面积:

6.28×100=628(平方米)

答:压过的路面的面积是628平方米。

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