diameter = 2*7 = 14mm
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It is hard to draw one here and do you mean radius 7 mm or diameter 7mm
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
The radius of the circle is half the diameter of the circle. 30mm radius would mean 60mm diameter or 6cm.