Question

The circumference of a circle is 138.16 centimeters. What is the area of the circle?

Answer 1

Circumference formula tells you $C=2 \pi r$

$C=2 \pi r$
$138.16=2 \pi r$
$21.99= r$
$r=21.99cm$
The formula to find the area of a circle is $A= \pi r^2$

$A= \pi r^2$
$A= \pi (21.99)^2$
$A= \pi (483.56)$
$A= 1519cm^2$