The diameter of a circle is two times its radius. Which equation shows another way to represent the area of a circle?

asked Apr 26, 2019 94.5k views

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If the area for a circle is
$A= \pi r^(2)$ , you can write it in terms of its diameter like this:
$A= \pi ( (1)/(2)d) ^(2)$

Ewan Delanoy answered Apr 29, 2019

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