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教育王國 討論區 教育講場 maths question(p.6) pls reply now
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maths question(p.6) pls reply now [複製鏈接]

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60
1#
發表於 12-4-19 21:48 |只看該作者 |正序瀏覽 |打印
The diameter of a circle is the same as the side of a square. If a string is tied around the circle or the square, which one needs a longer string to tie around it? Why?
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醒目開學勳章


15649
3#
發表於 12-4-27 02:19 |只看該作者
高達(0079) 發表於 12-4-19 21:48
The diameter of a circle is the same as the side of a square. If a string is tied around the circle  ...

Let D be the side of the square. D is also the diameter of the circle.

Perimeter of the square = 4D
Circumference of the circle = 3.14D

梗係4D大過3.14D啦!
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14102
2#
發表於 12-4-19 22:25 |只看該作者
length string required to tie around the shape = perimeter of the shape

perimeter of a square = 4 x side
perimeter of a circle = pi x diameter = 3.141592654 x diameter

so which one is longer ?
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