Radius = 1/2 of the diameter = 2 inches
Area of a circle = (pi) x (radius)2 = (pi) x (2)2 = 4 pi = 12.566 square inches (rounded)
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The area of a circle is A = pi times diameter² / 4. Given diameter d = 10 inches. Area A = 78.5398 inches².
In a circle with a diameter of 4, there would be approximately 12.56 square inches in the circle.
The area of a circle with an 8 inch diameter is: 50.27 square inches. There are: pi*4 squared = 16*pi square inches or about 50 square inches
diameter = 8 inches so the radius will = 4 inches area of a circle = pi*radius2 area = 50.26548246 or 50 square inches to the nearest square inch.
The area of a circle with a diameter of 4 inches is: 12.57 square inches.