A horizontal line is completely flat. You might think of the line catching an axis, as if it were intercepting a ball. When two lines cross each other, we say that they intersect. This is the same idea as the intersection of two roads. Line In geometry, lines are always straight.
Lines are one-dimensional, and they go on forever in both directions.
Line Segment Part of a line is called a line segment. Parallel Two lines are parallel if they never meet. Point A point is one location in space. Points are zero-dimensional. Back to Top Slope Slope is a number that shows how steeply a line slants.