12
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The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
Radius = diameter/2 = 24 inches
6 because the radius is half of the diameter.
radius is half diameter r = 1/2 x 24 = 12
The radius of a circle is always half the diameter: 48 / 2 = 24 inches.