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Typical answer from The WikiAnswers Community: IT IS WRONG!The diameter is the distance across the circle, through its centre. It is double the radius, not the other way round!
A table which is 90 inch around its outside (circumference) is 28.648 inches (to 3 dp) across (diameter).
circumference = {pi} x diameter circumference = {pi} x 24ft ~= 75.4ft
You take the radius (or diameter). If radius you times it by two (since it is half of the Diameter) then times the answer by 3.14. If diameter, times the diameter by 3.14. then round the decimals.
If the circumference of the circle is 2.5 inches then its diameter is 2.5/pi = 0.796 of an inch rounded up to 3 decimal places