The radius is half the diameter (R = D/2). The radius goes from the center of the circle to a point along the perimeter, while the diameter goes across the entire circle, connecting two points opposite each other along the perimeter.
If the radius is 7.5 feet, then the diameter is 13 feet.
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A circle with a radius of 75 feet has an area of 17671.458676442588 square feet. You calculate this by using the area of a circle formula, which is A=pi*r^2.
to get the radius of a circle given the diameter, than simply divide the diameter by 2 to get the radius. in this case, the answer to your question would be 37.5 cm. hope this helps!!!
radius = square root of (75/pi) = 4.886025119 diameter = 2*radius = 9.772050238 or 10 mm to the nearest integer
75 rounded
The area of a circle with a diameter of 75 inches is: 4,418 square inches.