The radius is 5 cm.
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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.
the radius of a circle is half of its diameter.
To get the radius just divide the diameter by 2. so, 10/2 = 5 cm
radius = diameter ÷ 2 ⇒ radius = 10 cm ÷ 2 = 5 cm
it is half the diameter e.g 10cm diameter = 5 cm radius