Project Euler #163: Cross-hatched triangles

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    As in the size two triangles we will be having 4 size 1 triangles i.e minimum number of triangle of any size will be 16*4=64. I am not getting how to find the rest as per the discussion below considering angles also apart from 30,60,90 which is the case of special triangle we can judge that rest triangle will be having minimum two angles equal so as to make two two opposite sides euqal. But How we can consider the angle parameter...

    Please help me in solving this.