Area of a circle = pi*radius squared
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The circumference of a circle with a 10in radius is: about 62.83 inches. (r x 2 x pi = circumference).
No. To biggest circle you could draw in a square with 100in would be one with a radius of 5in (10in diameter) since the squares dimensions will be 10in x 10in. So, working out the circumference with this radius: 2 x pi x 5 = 31.4 inches, which is greater than the 30 inches you want.
560
Area = 14in x 20in = 280in2 Area = 10in x 12in = 120in2
Multiply the two dimensions to get the area. In this case the calculation gives you 7,708 square inches, which divided by 144 gives you 53.53 square feet.