They have one point in common.
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No, they only have the one common endpoint in common.
Opposite rays are rays that share the same endpoint (have a common endpoint), but they also form a line.Not always.
Because we can't see the image you're referring to, we can't give the answer to which ray is opposite to BA. However, we can help. Opposite rays are two rays that both start from a common point and go off in exactly opposite directions. So, if there are two rays (BA and BC) with a common endpoint (B) going in different directions, they are called opposite rays.
What about them?These are known as opposite rays. They form a line.
That is a straight line.