Question

The area of a circle is 615.44 in2. What is the diameter of the circle? Use 3.14 for π.

Answer 1

Answer:

$\large\boxed{C=87.92\ in}$

Step-by-step explanation:

The formula of an area of a circle:

$A=\pi r^2$

r - radius

We have A = 615.44 in². Substitute:

$615.44=\pi r^2$

$\pi\approx3.14$

$3.14r^2=615.44$          divide both sides by 3.14

$r^2=196\to r=\sqrt{196}\\\\r=14\ in$

The formula of a circumference of the circle:

$C=2\pi r$

Substitute:

$C=2\pi\cdot14=28\pi\approx28\cdot3.14=87.92\ in$