Question

What is the formula of “area of circle”?

Answer

$\pi r^2\mathrm{ or }\frac{\pi d^2}{4}$
$\mathrm{Where}\pi =\frac{22}{7}\mathrm{ or }3.14$
$r=\mathrm{Radius\; of\; a\; circle\; or }\frac{d}{2}$
$d=\mathrm{Diameter\; of\; circle\; or }2\times r$

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