Question

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

Answer 1

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