Its diameter is: 2*4.2 = 8.4 cm
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In the case of a circle, or spehere, the diameter is twice the radius.
Area = pi*42 = 50.26548246 or about 50 square cm
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