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1 April, 12:41

Why do you think we need to mulltiply the circle area by two?

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  1. 1 April, 13:23
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    the usual definition of pi is the ratio of the circumference of a circle to its diameter, so that the circumference of a circle is pi times the diameter, or 2 pi times the radius ... This give a geometric justification that the area of a circle really is "pi r squared". Jan 29, 2008
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