Question

Henry knows that the circumference of a circle is 18 pie inches. What is the area of the circle?

O 36 x in 2
O 81x in 2
O 162 x in?
O 324 sin?

Answer 1

81x in 2 (B)

Explanation:

A = πr^2

Radius = 9

The Radius is 9 because you divide 18 by 2, the equation for Circumference is 2πr.

Answer: 81

Plug 9 into r in the Area equation.

π9^2

81π