Starting with the definition of polygon makes much easier to understand why triangle is a polygon.
Definition: A polygon is a closed figure bounded by sides.
Definition of triangle: Triangle is a closed figure bounded by three sides.
Since triangle is also a closed figure bounded by sides therefore, triangle is a polygon.
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A triangle is a 3 sided polygon
A triangle is a polygon, though trigon is an alternative name for a 3 sided polygon.
A triangle is a polygon with 3 sides
No, only an equilateral triangle is a rgular polygon.
Triangle