A triangle is a polygon. It can be regular or irregular. If it's regular, then all three
sides are the same length, and it's called an "equilateral triangle". If all three sides
aren't the same length, then it's an irregular polygon.
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It is irregular as not all the sides have the same length.
an irregular polygon is a polygon that is the opposite of a regular polygon in a regular polygon the sides are the same and the angles are the same and irregular is the opposite.
You would call it an irregular polygon. Afraid not. There is no specific name, except in the case of a triangle: scalene. You should not call it simply an irregular polygon, because a regular polygon implies that ALL sides are equal and ALL angles are equal. So a rhombus, where all four sides are equal, is still irregular.
an Irregular Polygon
A 3 side polygon is a TRIANGLE.