In Geometry that are many different types of polygons. The polygon whose angles equal up to 180 degrees is a 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.
It is a 29 sided polygon whose interior angles add up to 4860 degrees
A straight angle has 180 degrees. A triangle is a polygon whose interior angles add up to 180 degrees.
A decagon is a 10 sided polygon whose interior angles add up to 1440 degrees