The diameter of a circle is 21 inches. Find the area of the circle. (Use 22/7 as the approximation of pi.)

KarelG asked Apr 5, 2022

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KarelG asked Apr 5, 2022

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12 votes

Explanation:

Area of a circle is pi times r-square

$\pi \: {r}^(2)$

So...

$(22)/(7) * (21)/(2) * (21)/(2) = \frac{22 * {21}^(2) }{28}$

Do the rest yourself, my calculator and pen are not handy. Sorry

Gulbrandr answered Apr 10, 2022

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