Area = pi * r2
r = d/2 = 40/2 = 20
Area = 400*pi
= 1,256.636 approximate
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The area of the circle is 1,256.6 square inches.
Area of a circle = πr² (remember that r or radius is exactly half of the diameter) Radius therefore = 40/2 = 20 inches Thus the Area = 3.14159 × 20 squared = 1256.636 square inches
40'
Area of circle: pi*20^2 = 400*pi square units
400 x pi squinches