数学题:下图中圆的面积和长方形的面积相等
- 时间:2020-05-12 13:42:36
- 分类:数学世界
- 阅读:78 次
数学题:下图中圆的面积和长方形的面积相等,求长方形的周长。(单位:厘米)
数学题解答:
圆的面积=圆周率×半径×半径
长方形的面积=长×宽(宽就是圆的半径)
因为“圆的面积=长方形的面积”,所以“长方形的长=圆周率×半径”。
长方形的周长可以这样算:
(3.14×4+4)×2=33.12(厘米)
还可以这样算(两条长合在一起,就等于圆的周长,再加上两条半径就可以了):
2×3.14×4 + 4×2=33.12(厘米)
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