It is the set of all points that are at a distance of 1 cm from a fixed point (called the centre).
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The radius of a circle is half the diameter, so if the circle has a diameter of 2 cm, the radius would be 1 cm.
6 cm. The radius is 1/2 of the diameter.
The radius (radii) of a circle is 1/2 of the diameter. The radius of a circle with a 6.2 cm diameter is 3.1 cm.
83 = 512
5cm