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The parts of a circle
Age 10 · Maths
Open to everyone until Thursday, October 29
To keep it, print it while it is open.
Every point on a circle’s edge is the same distance from its centre. The diameter goes straight across through the centre and is always twice as long as the radius.
In the picture
- Centre: the point exactly in the middle of the circle
- Radius: a straight line from the centre to the edge
- Diameter: a straight line across the circle through the centre, twice the radius
- Circumference: the curved edge all the way around the circle
Examples
- A pizza cut straight through the middle: each cut is a diameter, and the crust is the circumference.
- A bicycle wheel: each spoke reaches from the hub in the centre out to the rim, like a radius.
Key takeaways
- Diameter = 2 × radius.
- The circumference is the distance all the way around the circle.
Quiz: The parts of a circle (Age 10)
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A circle has a radius of 4 cm. How long is its diameter?
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What is the circumference of a circle?
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Which line goes straight across a circle and passes through its centre?
The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.
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