Tells you the answer is 2*sqrt(314*pi) inches, which is approximately 62.82 inches
Seriously though. Use metric units in maths it makes everything just work!
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A = 2.4072 in2
A circle with circumference 30 in has area = 302 ÷ (4π) ≈ 71.6 in2 < 100 in2 so a square of area 100 in2 cannot fit inside it.
C = 36.433 inches.
The area of a circle is given by the formula A = πr2 where pi is the ratio of the circumference of a circle to its diameter and r is the radius. π = 3.1416 approx. A = π182 = 324π = 1017.88 in2 (2dp)
the area can not be cubed. the area is always squared. volume is cubed. the formula for area is pie multiplied by radius squared. your formula for your circle is... A = 121pi in2 the radius in your circle is 11 inches the formula for circumference is two times pi times the radius C = 2 * (3.14159) * 11 your answer is 69.11498in