Parts of a Circle
Maths: Year 5 & 6 National Curriculum, topic 8.5.1
Circle Basics
Circumference
- The circumference of a circle is the distance around the outside.
Diameter
- The diameter is the distance across the centre of the circle.
- The diameter is a straight line that passes through the centre of the circle.
Radius
- A straight line from the centre of a circle to its edge is called a radius.
- The radius is always half the length of the diameter.
Test yourself on Parts of a Circle
What is the name of the red line?
What is the name of the red line?
What is the name of the red line?
What is the diameter of a circle that has a radius of 4 cm?
What is the diameter of a circle that has a radius of 12 cm?