circumference(c)= 2 * pi * radius (r)
r = c / ( 2 * pi )
r = 45.53 / 2 * pi
r = 7.246 (approx)
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125.66m
If the circle's radius is 2.5 kilometers, then its diameter is exactly 5.0 kilometers, with no rounding required.
A circle with a radius of 3.2 yards has a circumference of 20.11 yards.
A circle with a radius of 21 cm has an area of ~1,385.44 square cm
c = 18.8