Any n-sided polygon (n being any integer) will always have a minimum of n-2 triangles inside the shape, assuming that the polygon is regular with no reflex angles.
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There are 3 triangles inside a 5 sided pentagon polygon
You could draw four different triangles in a 4-sided polygon, but two are enough to define the polygon.
16
A 16 sided polygon is made from 14 triangles
Two triangles can be formed by the diagonals of one vertex of a four-sided polygon.