radius = 40/(2*pi) in inches
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The formula to figure out the circumference of a circle is C=2(pi)r. So with a circle that has a radius of 40 inches, you can set up the formula like: C=2(pi)40. To figure this out on a calculator, multiply 2 with pi and then multiply that answer with 40. If you do not have a pi symbol on your calculator you can multiply 2 with 3.14159 then multiply that answer with 40.
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.
Circumference of any circle = 2*pi*radius or diameter*pi
251.2 feet
Radius = 3.57 inches.