Editorial for COCI '06 Contest 1 #2 Herman

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
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A circle in taxicab geometry is a square in regular geometry (at an angle of $45$ $45$ degrees if when placed in a Cartesian coordinate system). The area of such a "circle" is thus $(\sqrt 2 r)^2 = 2r^2$ $(\sqrt{2} r)^{2} = 2 r^{2}$ .

The area of a regular circle is $\pi r^2$ $π r^{2}$ . $\pi$ $π$ can be embedded in the source code as a constant or calculated (better) as $4 \operatorname{atan}(1)$ $4 atan (1)$ or $\operatorname{acos}(-1)$ $acos (- 1)$ . Some implementations of the C language define the constant M_PI in the header <math.h>, though this is not defined by the C standard.

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