it is 3.5 cm
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14 cm. The diameter is just the radius times 2.
Assuming that "it" refers to diameter, the radius is 7 cm and the circumference is 44.0 cm.
The diameter of a circle is twice the radius. When the diameter is 7 metres, the radius is 3.5 metres.
A circle 14 inches in diameter has a radius of 7 inches, and a circle having a radius of 7 inches has a diameter of 14 inches.
Diameter is twice the radius=14"