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Earn +20 ptsQ: What is 2pir?
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Continue Learning about Algebra
How do you find circumference given the radius?
Remember the eqution and comit to memory C = 2pir or C = pi d Where 'C' is the circumference 'r' is the radius 'd' is the diamter. and 'pi' is the constant of proportion of circles at 3.141592.... usually approximated to 3.14 e.g. If the radius is 5 Then C = 2 * 3.14 * 5 C = 10*3.14 C = 31.4
What is the equation for finding the circumference of a circle from the radius?
circumference equal two times 'pi' times radius. It is written algebraically as C = 2pir Since 2r = d (diameter) Then C = pi*d Also the area (A) of a circle is A = pi*r^(2) 'pi' is the constant of proportion of circles. NB For school work pi = 3.14 or pi = 3.1416 or pi = 22/7
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