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)

圆和长方形面积相等,求长方形的周长

数学题解答

圆的面积=圆周率×半径×半径

长方形的面积=×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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