Question

Find the area of a circle with a radius of 21 inches. Use

area: about
in.
22/7
for π.

Answer 1

`1386 in^2`

Circle Formulas

r: radius

Circumference:
`2\pi r`

Area:
`\pi r^2\\`

In this case, we are using 22/7 as an estimation for pi.

Q)

Plug into the area formula.

22/7 * (21)^2

22/7 * 441

`1386 in^2`