The radius is half of the diameter, and 1/2 of 24 is 12. The radius is 12mm.
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d=2r, d=2x12mm=24mm
The radius of a circle is half of its diameter
1/2 of the diameter
The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm
7cm; the diameter of a circle is twice its radius.