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square has 2 equal sides
A straight angle is an angle.
By a straight angle I assume you mean an 180° angle, so two angles that form a 180° angle would be called supplementary angles.
When a ray divides an angle(Which is formed by 2 straight lines) in half that is equally on both the sides, it is termed as Angle Bisector.
The exterior angle sum of ANY plane polygon (ie 2-dimensional figure with straight sides) is 360 degrees.