关于报刊亭的数学题

  • 时间:2020-05-12 13:38:15
  • 分类:数学世界
  • 阅读:136 次

关于报刊亭的数学题圆柱形售报亭的底面直径和高相等(如图),在报刊亭上开一个边长等于底面半径的正方形售报窗口,问:窗口挖去的圆柱部分的面积占原来圆柱的侧面积的几分之几?

报刊亭图片

这题谁会解答?

分享一种解法:

(r*r)÷(2*π*r*2*r)= 1/(4*π)

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