91热爆

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.

More on Shape, position and movement

Find out more by working through a topic