Yes, it has endpoints which is where it begins.
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A ray begins at an endpoint and extends in only one direction.A half line does not include the endpoint.
---> da
Ab and Ba are the same line because there are no endpoints to a line. Therefore, you can reverse the order of the letters. So, Cd and Dc are not the same ray because the first letter is the endpoint. So on ray Cd, point C is the endpoint and d is a point on the line coming from the endpoint. On ray Dc, D is the endpoint.
Opposite Rays - are collinear rays having the same endpoint.