Question

The diameter of the circle is 13 cm.
What is the circumference of the circle?
Give your answer in centimetres to 1 decimal place.

Answer 1

Circumference of a circle = 2 * pi * radius

C = 2*pi*r

diameter = 13
radius = diameter/2
radius = 13/2 = 7.5

C = 2*pi*7.5= 13pi or approx 40.8