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Return how many Triangular Tiling grid points there are inside a circle of radius *r* centred at (0,0) (including points on the edge).

Assume that a Triangular Tiling grid is a 2D Hexagonal Bravais lattice with | *a1* | = | *a2* | = 1 and *φ* = 120°.

Neither **string operations** nor **interpolations** are allowed!

18 correct solutions
12 incorrect solutions

Last solution submitted on May 14, 2015