The circumference of a circle with a 10in radius is: about 62.83 inches. (r x 2 x pi = circumference).
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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.
Area of a circle = pi*radius squared
The circumference of a circle if radius is 25 is about 157.1
The circumference of a circle with a 2pi radius is: 39.58
The radius of a circle with a circumference of 59 is: 9.39