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.
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Area of a circle = pi*radius squared
Area = pi*302 = 2827.433 square inches to 3 decimal places
The area of a 7-inch circle is: 38.48 square inches.
The area of a 26-inch diameter circle is 530.93 square inches.
Area of a circle = pi*radius2