The 3 interior angles of a triangle add up to 180 degrees
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The sum of the three INTERIOR angles is 180 degrees. And a 3-sided polygon is often referred to as a 'Triangle'.
There is no such shape because shapes or polygons must have 3 or more sides and there are 3 interior angles in a 3 sided polygon which is a triangle that add up to 180 degrees.
No because the interior angles of a four sided shape can't exceed 360 degrees.
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
A 3-sided shape is called a triangle.or Polygon in general.