36/pi = 11.4591559 feet
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36 feet across, 18 feet from centre to circumference, or 113.1 ft (approx) around the circle.
Consider the straight side as the diameter of a circle, find the circumference of the circle, calculate half the circumference and then add it to the diameter. circumference = pi x diameter = 3.14 x 36 = 113.04 perimeter of semicircle = 1/2 circumference + 36 = 56.52 + 36 = 92.52
The answer depends on what is 36 cm: the radius, diameter or some other aspect of the circle.
The circumference is: 36*pi = 113.097 inches rounded to three decimal places
Circumference of any circle = 2*pi*radius or diameter*pi