r=11.5

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=11.5 into the formula for the area of a circle. Pi π is approximately equal to 3.14.

π⋅11.52

Raise 11.5 to the power of 2.

π⋅132.25

Multiply π by 132.25.

415.47562843

Find the Area circle (11.5)