Question

A circle has a radius of 3.93 inches. Using the correct number of significant digits, find the circumference and the area of the circle.

The circumference is ____ in.
The area is ____ in.

Answer 1

The circumference is 24.69 in.

The area is 48.52 in.

Explanation:

• Circumference rule => Cf=2πr

So, Cf=2π(3.93)=24.69in

• Area rule => A=πr^2

So, A=π(3.93)^2=48.52in