The circumference C of any circle is equal to pi*diameter. The diameter is equal to the radius times 2. So, for a circle with radius 48, it has a diameter of 96, and a circumference of 96*3.14=301.44. This of course is using 3.14 as an estimate for pi.
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A circle with a 48-inch radius has a circumference of about 301.592 inches.
A circle with a radius of 24 inches has a circumference of 150.8 inches.
radius = 48/(2*pi) = 7.639437268 or 7.639 inches to 3 decimal places
To find the diameter, 48/pi To find the radius, (48/pi) then divide by 2 :)
If a circle circumference is 30 the radius is: 4.77