3 cm
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The radius of a circle is 1/2 of its diameter. If the diameter is 15 meters, then the radius is 7.5 meters.
The diameter of any circle is twice the radius. Since the radius of this circle is 15mm, the diameter is 15mm*2=30mm. 30mm is also 3cm.
7.5Radius of circle: 15/2 = 7.5 cm
The radius is 15 feet 2r=30 30/2=15 15 is the radius
15 cm