1. The verdict to the first statement that Two rays with the same /endpoint are opposite rays is; Sometimes. This follows from the fact that two rays may have the same end point and may not be opposite rays.
2. The verdict about the statement that; The union of two opposite rays is a line is; Always. This follows from the fact that the end point of such opposite rays is the starting point of the other ray.
In it's most primitive definition, a ray can be defined as a representative of a line with a starting point and advancing in a particular direction such that it does not have a particular ending point.
On this note, ray AB cannot be called ray BA.
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