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That is the definition of a triangle. If it did not have three sides it would not be a triangle. If it did not have three angles, it would not be a triangle.
A triangle with three sides is a polygon.
An equilateral triangle is a triangle in which all three sides are equal. An example is a triangle with 60o in all three corners.
a triangle is a polygon with three sides.
There are three straight edges in a triangle.