The circumference of a circle of radius r. pi is approx 3.14.
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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
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