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To find the diameter, 48/pi To find the radius, (48/pi) then divide by 2 :)
Radius = diameter/2 = 24 inches
radius = 48/2 = 24 km
The radius of a circle is always half the diameter: 48 / 2 = 24 inches.
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.