The diameter is double the radius.
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15mm. diameter is twice the radius
Well, honey, the radius of a circle is always half of the diameter. So if the diameter is 30 mm, the radius would be 15 mm. It's basic math, darling. Hope that clears things up for you!
radius = 1/2 x diameter= 1/2 x 39.5 mm= 19.75 mm
12mm - half the diameter.
The radius would be 2.5 mm.