The diameter of a 10 cm wide circle is 10 cm. The diameter is just how wide it is.
The radius is 1/2 X diameter. 1/2 X 10cm = 5 cm.
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it is half the diameter e.g 10cm diameter = 5 cm radius
10cm
20 cm
radius = diameter ÷ 2 ⇒ radius = 10 cm ÷ 2 = 5 cm
you double the radius to find the diameter.