Question

D) Calculate the area of a circle with a circumference of 31.4 in.

Answer 1

answer:78.5

for explanation see the picture

Answer 2

A ≈ 78.54

Explanation:

Area of a circle is A=πr^2

Since you do not know r (radius) you take the formula for the circumference of a circle (C=2πr), plug in 31.4 for C, and solve for r

Now that you have the radius of 4.99746521, you round it up to 5 and solve the area formula with 5 in as r.