It will be twice as much and so the diameter is 2 times 13.5 = 27
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the diameter of a circle is from one side of the circle to the other, and the raduis is always half, because the raduis is from the side to the middle, so the answer is 18
8 inches.
Divide the diameter by 2.
Well, if you know the diameter of the circle already, then you can divide it by half to get the radius. If you don't have the diameter however, then you simply have to find the middle of the circle and measure from the middle of the circle to the edge. That would be your radius.
If the diameter is 9 units then the radius (not raduis) is 4.5 units.