Multiply by 2 ! A radius is half a diameter !
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If the diameter is 9 units then the radius (not raduis) is 4.5 units.
If the radius (not raduis) is 25 feet then the diameter is 50 feet.
Assuming daimeter = diameter and raduis = radius, 1 diameter = 2*radius.
Radius = Diameter/2 so if diameter = 20 Radius = 20/2 = 10
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