I want a method for find the number triangles in the under image.
Start from the top. Take every juncture point and calculate the number of triangles starting, and going downward (i.e. the triangle is wholly under that point), from that point. Then add up.
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Start from the top. Take every juncture point and calculate the number of triangles starting, and going downward (i.e. the triangle is wholly under that point), from that point. Then add up.