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Circle Parts on a Wooden Disc
Age 10 · Maths
A circle has a centre point, a radius from the centre to the edge, a diameter across through the centre, and a circumference around the edge. The diameter is twice the radius.
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Age 10: open this week
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In the picture
- The centre point: the fixed point in the middle of the circle.
- The radius: a straight line from the centre to the edge.
- The diameter: a straight line across the circle through the centre.
- The circumference: the curved line all the way around the edge.
Examples
- A bicycle wheel has a centre, a radius, a diameter, and a circumference.
- A round pizza has a centre and an edge you can trace around.
Key takeaways
- The diameter is twice the radius.
- The radius is half the diameter.
Quiz: Circle Parts on a Wooden Disc (Age 10)
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Which part is the curved line all the way around the edge of a circle?
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Which part is a straight line from the centre of a circle to its edge?
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If the radius of a circle is 6 cm, what is the diameter?
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