Answer:
[tex]\large\boxed{C=87.92\ in}[/tex]
Step-by-step explanation:
The formula of an area of a circle:
[tex]A=\pi r^2[/tex]
r - radius
We have A = 615.44 in². Substitute:
[tex]615.44=\pi r^2[/tex]
[tex]\pi\approx3.14[/tex]
[tex]3.14r^2=615.44[/tex] divide both sides by 3.14
[tex]r^2=196\to r=\sqrt{196}\\\\r=14\ in[/tex]
The formula of a circumference of the circle:
[tex]C=2\pi r[/tex]
Substitute:
[tex]C=2\pi\cdot14=28\pi\approx28\cdot3.14=87.92\ in[/tex]
