Well this depends on If the radius is 40 inches or If 40 inches is the entire diameter.
Circumference is determined using the formula Pi x Radius²
Assuming 40 is only a radius it would be 3.14 x 40² or 3.14 x 1600 = 5024 inches
If 40 inches is the entire diameter then its simply Pi x Diameter since the entire diameter is the radius squared. 3.14 x 40 = 125.6 inches.
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radius = 40/(2*pi) in inches
The circumference of a circle is calculated using the formula C = πd, where C is the circumference, π is a constant approximately equal to 3.14159, and d is the diameter of the circle. In this case, the diameter is given as 80 inches. Plugging this value into the formula, we get C = π(80) = 251.327 inches. Therefore, the circumference of the circle with a diameter of 80 inches is approximately 251.327 inches.
7.227
radius X 2 X pi = circumference 40 x 2 x 3.14 = 251.2"
7 foot circumference X 12 inches/foot = 84 inches in circumference