A Ray
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segment
They are alike because a ray is part of a line, a segment is part of a line, and a line is basically a line. They are different because a segment has two end points; a ray has one, and a line is a group of points on a straight path that extends to infinity like a ray extends to infinity in one direction
A ray
A ray starts at a point and extends forever in ONE direction. A line starts at a point and extends forever in TWO directions.
A straight line is one which travels in exactly one direction, never bending or curving.