The area of the circle: pi*15*15 = 225*pi square measurements
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The diameter of a circle is the distance across it, passing through the center. If the diameter is 30 cm, that means the full width of the circle from one edge to the opposite edge is 30 cm. Therefore, the diameter is simply 30 cm.
A circle with a radius of 30 meters has an area of 2827.43 square meters.
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.
225pi sq m
The circumference of a circle 30 inches in diameter is 30*pi inches