A triangle.
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An irregular polygon with 5 or more sides.
Interior angles and if it has more than 3 sides also diagonals
A polygon has 3 or more sides and is called regular when all sides and angles are equal and it is irregular when its sides and angles are not equal.
A triangle.
A triangle is a shape that has 3 sides and 3 corners. It is a three-sided polygon, which is a plane shape bounded by three straight lines.