what i do is square it 30x30 = 900 devide it by 100 and x it by 78.5398 =706.8582
78.5398% is correct for doing it this way.
(78.5398163397425)
Improved answer:
Area of a circle = pi*radius2
Area = pi*152 = 706.8583471 square inches
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The area of a circle that has an 8.5 inch diameter is: 56.75 square inches.
Area of a circle = (1/2 x diameter)2 x piArea of a 24 inch diameter circle:(12 inches)2 x 3.1416 = 144 square inches x 3.1416 = 452.4 square inches
70.9 square inches.
The approximate area of a circle with a 12-inch diameter is: 113 square inches.
A 4-inch diameter circle has an area of 12.566 square inches.