r=31.5

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=31.5 into the formula for the area of a circle. Pi π is approximately equal to 3.14.

π⋅31.52

Raise 31.5 to the power of 2.

π⋅992.25

Multiply π by 992.25.

3117.24531052

Find the Area circle (31.5)