A circle with a radius of 15 inches has a circumference of: 94.2 inches.
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Radius is 2.39
Circumference = Pi multiplied by the diameter. C = (3.1415)(15 in.) = 47.12 in. Therefore, the circumference of a circle with a diameter of 15 in. and a radius of 7.5 in. is approximately 47.12 inches.
Radius = 15 / 2 Pi or 2.3873 inches (rounded to 4th decimal).
Circumference = pi x diameter so if the radius is 5 then the diameter is 10 Circumference = pi x 10 = 31.415 If we triple the radius to 15, then the diameter is 30, so Circumference = pi x 30 = 94.245 Which looks like triple the first circumference. So if the radius is tripled, the circumference is also tripled.
radius = 94.2/(2*pi) = 14.99239564 or about 15 yards