Answer:

*In geometry, a line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line that is between its endpoints.

*In geometry, a ray can be defined as a part of a line that has a fixed starting point but no end point. It can extend infinitely in one direction.

*In geometry, collinearity of a set of points is the property of their lying on a single line. A set of points with this property is said to be collinear.

*In Euclidean geometry, the intersection of a line and a line can be the empty set, a point, or a line.

*Lines in a plane or higher-dimensional space are said to be concurrent if they intersect at a single point.

*In geometry, parallel lines are lines in a plane which do not meet; that is, two straight lines in a plane that do not intersect at any point are said to be parallel.