r=0.25

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=0.25 into the formula for the area of a circle. Pi π is approximately equal to 3.14.

π⋅0.252

Raise 0.25 to the power of 2.

π⋅0.0625

Multiply π by 0.0625.

0.19634954

Find the Area circle (0.25)