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a linear pair!
what is formed by two opposite rays?
Opposite rays are rays that share the same endpoint (have a common endpoint), but they also form a line.Not always.
Opposite rays are halves of a line. There is one endpoint and the two rays extend infinitely from it in opposite directions. The endpoint can actually be any point on the line, but it can be assumed to be the midpoint.
180 degrees because opposite rays form a straight line.