For example
Measure from the middle of a steelpan to its rim to find the radius.
In Grade 4
Children measure from the centre of a circle out to the edge in several directions and find it never changes.
Watch out for
Children often measure the radius from the edge rather than from the centre. Every radius starts at the centre point.
Say it at home
Draw round a cup, find the centre by folding, and measure out to the edge.
Try it together
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