60 mm, or 6 cm, or even 0.06 m, finally, and although correct most foolish, 0.00006 km. but you really should learn to do your math, not ask questions on answers.com
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12 cm A diameter is twice as long as the radius of a circle. D = 2r D = 2(6cm) = 12cm
The circumference of circle with radius 12cm is 75.4cm
The radius of a circle is the distance from the centre to the edge. The diameter is the distance right across the circle through the centre. So the diameter of a circle is always twice its radius. So if the radius of a circular CD is 6cm, the diameter is twice this - 12cm.
The circumference of a circle if the diameter is 12cm is 37.7cm
The diameter is twice the radius and so it is 24cm