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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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