A line is a one dimensional geometrical object with negligible width and depth.
When 2 lines meet at a point, they form an angle at that point. The point is called the vertex of the angle and the 2 lines are the arms. There are different types of angles based on the position of the arms.
Learn about the angles formed when two lines intersect and the relationship between these angles.
A transversal intersecting two parallel lines has the following properties: