Twice as much and so the diameter is 2 times 8.5 = 17 units
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Radius = Diameter/2 Diameter = 2* Radius
A radius is one half of a diameter so divide by two to get from a diameter to a radius. Or you can multiply the radius by 2 to get to the diameter.
A 235 85 16 tire is 31.72 inches in diameter and has a 15.86 inch radius and a 99.65 inch circumference
A radius is half of a diameter. Example Diameter:4 Radius:2
The diameter of a circle is twice its radius.