A polygon with three angles is called a triangle. This is easy to remember because the word can be thought of as tri-angle. Angle just means the angles in the shape. Tri means three, as in tricycle (three wheels) or triceratops (three horns).
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A triangle
Triangle
an equalateral triangle. im not sure if thats how you spell it.
Polygon
A three-sided polygon is a triangle. The angles in a triangle add up to 180 degrees.