It is impossible to measure a line because a line has no beginning or end point. You can only measure a line sector. A ray has a beginning point, however, but goes on in one direction endlessly.
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Yes, both a ray and a line go on forever, but unlike a line, and like a line segment, a ray has an endpoint.
a ray continues on and on but a line segment stops
a ray and a line
It is a segment in case you do not know what a segment is it is a line with two end points
both are a part of a line