The formula for the area of a circle is A = is πr2, where π is 3.14159 rounded to five decimal places, and radius is 1/2 the diameter.
Radius = 4.5in/2 = 2.25in
A = πr2 = 3.14159 x (2.25in)2 = 3.14159 x 5.0625in2 = 15.9042in2
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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.