a triangle
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In Geometry that are many different types of polygons. The polygon whose angles equal up to 180 degrees is a triangle.
The sum of the interior angles of a polygon with n sides is (n-2)*180 degrees.
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.
The total for the interior angles depends on the number of sides. The formula for the total of interior angles of an n-sided polygon is sum =180(n-2). This is 180 degrees for triangles, 360 degrees for quadrilaterals, and 540 degrees for pentagons.
(number of sides-2)*180 = total sum of interior angles The total sum of exterior angles for any polygon add up to 360 degrees