Mathematics for IGCSE & O level - Mensuration (Section 8 - No. 13)

If the circumference of a circle is 31.4 cm, what is its approximate radius?

2.5 cm

5 cm

10 cm

15 cm

Circumference = 2 * pi * radius. radius = circumference / (2 * pi). radius = 31.4 / (2 * 3.14) = 5cm