# How many triangles are there?

The question is how many triangles are there in the following picture?

I have thought to solve it by creating a formula based on the angles of the lines starting from the bottom of each side. I don’t get it right though. Any clues/ideas would be appreciated.

@Sp3000 is right, this is actually $PE-163$, and your particular case is given in the problem statement $T(2) = 104.$