fbpx

Areas of Circles and Circle Segments GCSE Maths Revision

Part 01 – Calculating the circumference (perimeter) of a circle

Example:

Calculate the circumference of the circle below correct to 3 significant figures.  C=2πr

Worked Solution:

Use the formula for finding the circumference of a circle C=πd=2πr where d is the diameter of the circle and r the radius. You should know that 2r=d. Hence:

C=π×4.56

3.14 × 4.56= 14.3256625

14.3 cm  (to 3 s.f.)


Your turn:

Calculate the circumference of the circle below correct to 3 significant figures.  C=2πr

Enter your answer here:

Other questions in this topic:

Need some extra help? Find a tutor now

Or, call 020 3633 5145