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
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The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The area of a 3-inch diameter circle is about 7.068 square inches.
There are 100*pi square inches in a 20 inch diameter circle
A circle with a diameter of 198 inches has an area of 30,790.75 square inches.