4cm
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The diameter of a circle is always twice the length of the radius. Therefore, if the radius is 13 centimeters, the diameter would be 2 x 13 = 26 centimeters.
The diameter of any circle is twice the radius. Since the radius of this circle is 15mm, the diameter is 15mm*2=30mm. 30mm is also 3cm.
Radius = Diameter / 2 In this case, diameter = 8 cm so radius = 4 cm
The diameter is double the radius, and the radius is 1/2 of the diameter.If the radius is 8 cm, then the diameter is 16 cm.
It is: 2*4 = 8 cm