The area of a circle when the diameter is 30 inches is: 706.9 square inches.
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The area of a circle with diameter of 16 inches is: 201.1 square inches.
The area of a circle with a diameter of 4 inches is: 12.57 square inches.
The area of a circle with a diameter of 9 inches is: 63.62 square inches.
A circle with a diameter of 12 inches has an area of ~113.1 square inches.
A circle with a diameter of 7 inches has an area of 38.48 square inches.