Area of a circle: pi*radius*radius
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(6 pi) inches.
28.3
You can multiply them as mixed fractions, or convert both to inches, then divide by 144 (sq in / sq ft). 9 ft = 108 in, add 7 in = 115 in. 3 ft = 36 in, add 6 in = 42 in. Multiply (115 in) x (42 in) = 4830 sq in. Divide by 144 (sq in/sq ft) = 33.541667 sq ft.
6 inches
If 6 inches is the radius, replace it in the formula: A=pi x radius2. If 6 inches is the diameter, divide it by 2 first, to get the radius.