Any help with Beta 1 (C) Ancient Berland Circus

Revision en1, by AFGhazy, 2015-09-01 13:17:12

I understood where the formula n / 2 * ( R2 ) * sin(2 * \pi / n)

but I couldn't understand why n = pi / gcd( of the three angles in the given triangle )

thanks in advance.

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en1 English AFGhazy 2015-09-01 13:17:12 229 Initial revision (published)