Circumference of a circle | Maths | Quizalize & Oak National Academy

Starter quiz

Which part of the circle is labelled?
- circumference
- diameter ✓
- radius
If a circle has a diameter of 12 cm then its radius will be ______ cm.
- '6' ✓
$\pi$ is the ratio between which two parts of a circle?
- the radius and diameter
- the radius and circumference
- the diameter and circumference ✓
Which two formulae can be used to calculate the circumference of a circle?
- $C = \pi d$ ✓
- $C = 2\pi d$
- $C = \pi r$
- $C = 2\pi r$ ✓
A circle with diameter 12 cm has a circumference of ______ cm.
- 6 $\pi$
- 12 $\pi$ ✓
- 24 $\pi$
A circle with radius 20 cm has a circumference of ______ cm.
- 10 $\pi$
- 20 $\pi$
- 40 $\pi$ ✓