## Answer

###### Wiki User

###### 08/07/2008

The area of any circle is equal to [pi] times its radius squared. Solving the simple equation will give us: [pi]*r^2 = 42mm^2 r^2 = 42 / 3.1415 = 13.369 mm^2 r = sqrt(13.369) = ~3.66mm "^2" means squared "sqrt" means square root "~" means about.

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