## 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.**Submitting an official solution before solving the problem yourself is a bannable offence.**A circle in taxicab geometry is a square in regular geometry (at an angle of degrees if when placed in a Cartesian coordinate system). The area of such a "circle" is thus .

The area of a regular circle is . can be embedded in the source code as a constant or calculated (better) as or . 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.

## Comments