Area = pi*302 = 2827.433 square inches to 3 decimal places
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Area of a circle = pi*radius squared
You can calculate the area of a circle with the formula: A = pi x radius2 If the 30 inches refers to the diameter, divide it by 2 to get the radius.
The radius is 30 inches.
A circle with a radius of 30 meters has an area of 2827.43 square meters.
If a circle circumference is 30 the radius is: 4.77