If you are talking about around the circle (Circumference) then the are about 3.14 diameters and 6.28 radii
While if you are talking about just across, the 1 diameter and 2 radii.
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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.
The radius of the circle is half the diameter of the circle. 30mm radius would mean 60mm diameter or 6cm.