The radius is the straight line distance from the centre of the circle to any point on the circumference of the circle. It can be measured in 'mm', or 'inches' or other units both metric and imperial .
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If the circumference of a circle is 12 cm the radius is: 1.91 cm
A circle with a radius of 0.5 cm has a circumference of 3.14 cm.
A circle with a radius of 7.7 cm has a circumference of 48.38 cm
A circle with a radius of 208 cm has a circumference of 1306.9 cm
A circle with a radius of 9.2 cm has a circumference of 57.81 cm