Triangle.
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A 3-sided polygon is called a "triangle".The angles of a triangle don't equal 180 degrees.They total 180 degrees when they're added.
A three-sided polygon is a triangle. The angles in a triangle add up to 180 degrees.
The 3 interior angles of any triangle add up to 180 degrees
In Geometry that are many different types of polygons. The polygon whose angles equal up to 180 degrees is a triangle.
A regular polygon that has 180 degrees is an equilateral triangle.