You must use the information that you do have about that cicle, along with the
equations and formulas you've learned that give the relationship between the
kind of information you have and the radius of cicles in general.
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To find circumference you must multiply twice the radius by π, or using the diameter, if it gives it to you, multiply that by π.
circumference = pi * 2radius (diameter) so to find radius you use circumference/(2 x pi) this will find radius ----
The diameter is twice the radius. So multiply the radius by 2
you find the radius of a cone by the bottom of it or the round part
the radius is half the diameter