Apolygon is a triangle if and only if it has exactly 3 sides

Yes, a polygon must have exactly 3 sides to be called as a triangle.

Step-by-step explanation:

Yes, a polygon must have exactly 3 sides to be called as a triangle.

There must be at least three sides to make a polygon i.e. a polygon must have at least three sides and it may be any number more than 3. The polygon with four sides is called a quadrilateral, with five sides is called a pentagon, with six sides is called a hexagon and so on.

If we deal with less than three sides, say 2 sides or one side then it is not possible to form a closed figure and a polygon is always a closed figure.

(Answer)

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