91热爆

Watch: Parts of a circle

All circles have a circumference, diameter and radius. They can be measured using a ruler or tape measure.

  • The circumference is the distance all the way around a circle.
  • The diameter is the distance right across the middle of the circle.
  • The radius is the distance halfway across the circle. The radius is always half the length of the diameter.

Back to top

Activity

Back to top

NEW! Play Guardians: Defenders of Mathematica - the winter update. game

It's Mathematica as you鈥檝e never seen it before, with all-new festive backgrounds and costumes. Available for a limited time only. Use your maths skills to save the day before it's too late!

NEW! Play Guardians: Defenders of Mathematica - the winter update
Back to top

More on 2D shapes

Find out more by working through a topic