an acute angle
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A 180 Degree angle therefore a straight line.
A single ray.
It would not have sides because it would be a straight line. A straight angle is 180 degrees. Anything above that is a "Reflex"
No, a segment is a piece of a line. However, two segments that intersect at a point make an angle. In fact, the segments that make up the angle are called the sides of the angle.
No? Wouldn't they then be supplementary? Opposite rays make a straight angle/line, and if the exterior sides made the straight angle, the adjacent angles would be supplementary. ...Right?