Question: A geographer is studying a triangular grid of weather stations where true equilateral triangles have sides aligned to a coordinate system based on modulo $6$ symmetry. If the distance between adjacent stations in one direction is $60$ km, how many integer-coordinate points (lattice points) lie strictly inside a large equilateral triangle with side length $6$ units (in km), assuming the vertices are at lattice points satisfying modular constraints? - Appfinity Technologies