180 degrees because opposite rays form a straight line.
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straight angle
what is formed by two opposite rays?
A side refers to one of the rays that form an angle. Vertical are also called opposite angles. They are nonadjacent angles formed by intersecting lines.
Angle An angle is formed by 2 rays extending from the same endpoint.
There is no equivalence. An angle is a measure of rotational displacement. It is formed by two rays (or lines) and does not create an enclosed space. An area is a measure of an enclosed space.