Question

Find the area and the circumference of a circle with diameter 9 yd.

Use the value 3.14 for , and do not round your answers. Be sure to include the correct units in your answers.
9 yd
Area:
Circumference:
yd

Answer 1

Area = 63.585 yd²

Circumference = 28.26 yd

Explanation:

Area of a circle = πr²

Since the diameter is 9, the radius is 4.5. Solve:

A = 3.14 x 4.5² = 3.14 x 20.25 = 63.585 yd²

Circumference = 2πr

C = 2 x 3.14 x 4.5 = 28.26 yd