Q13 of 160 Page 144

How many non-overlapping triangles can we make in a n-gon (polygon having n sides), by joining the vertices?

There can be n-1 lines that can be drawn from one vertices. Out of these 2 sides are adjacent sides so n-3 lines can be drawn. When a n-gon is divided by n-3 lines the n-gon is divided into n-2 triangles.

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