It is the number of sides of the polygon minus two as for example a pentagon has 5 sides and so 5-2 = 3 triangles
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That polygon is called a "triangle". It has no diagonals.
As it wouldn't be a triangle. If you forced this, you would then have formed an irregular polygon square missing a side.
It depends on the polygon. A triangle has 3, a square has 4, etc.
A triangle is a 3 sided polygon
A regular polygon that has 180 degrees is an equilateral triangle.