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The diameter is twice the radius so a circle with a radius of 2.5 will have a diameter of 5.
5 because the radius is half of the diameter
A circle's radius is always 1/2 of the circle's diameter, so the radius of a circle of 5-inch diameter is 2-1/2 inches.
it is half the diameter e.g 10cm diameter = 5 cm radius
The diameter of a circle is twice its radius