18cm is about 7 inches
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A = 254.47 cm2
radius = 18/2 = 9 cm
12.99 x 7.087
I do not know the diameter of a US dime and, to be honest, do not care. However, for the benefit users of Answers.com, firstly, not everyone knows the size of a dime and secondly I do not for a moment believe a US coin would be 18 centimetres = 7 inches (approx) in diameter! <><><>><>><> 18 centimeters equals approximately 7.09 inches. My hand is of average size and it is about 18cm long.
The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi