Circles
1 Jenny tells all her friends to stand so they are exactly 2 metres from her. She notices that they made the shape of a circle A circle is a shape where all points on the circle are the same distance from the centre. This is called the radius.
2m
radius
2 The distance across the centre of a circle is called a diameter. It is equal to 2 radii.
4 cm
8 cm
The radius of my circle is 4 cm. Therefore, it has a diameter of 8 cm.
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