r=18in

The area of a circle is equal to Pi π times the radius r squared.

π⋅(radius)2

Substitute in the value of the radius r=18 into the formula for the area of a circle. Pi π is approximately equal to 3.14.

π⋅182

Raise 18 to the power of 2.

π⋅324

Move 324 to the left of π.

324π(in)2

Find the Area circle (18in)