The length of the diameter will be 30 cm if the radius is 15 cm.
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The radius of the cylinder would be 0.64cm ! The radius is half the diameter - length has nothing to do with the question !
26 cm
15 cm
7.5Radius of circle: 15/2 = 7.5 cm
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.