Medium
If the circumference of a circle is 132cm, what is the radius of the circle?
Explanation
Explanation
Circumference = 2 x pi x r. So r = Circumference / (2 x pi) = 132 / (2 x 22/7) = 132 x 7 / 44 = 21cm.
PRO TIP
Re-check your working by substituting the answer back into the original question.