Vertical

In geometry, a vertical line is one which runs from up and down the page. Its cousin is the horizontal line which runs left to right across the page. A vertical line is perpendicular to a horizontal line.
See perpendicular lines.

Vertical angles

Vertical angles are different use of the word 'vertical'. Vertical angles are angles that share a common vertex and need not be drawn one above the other. See Vertical angles.

Coordinate geometry

A line will be vertical if any two points on the line have the same x-coordinate.
See Vertical line (coordinate geometry).

Other line topics

• Point definition
• Line definition
• Vertical lines
• Horizontal lines
• Line segment
• Midpoint of a line
• Ray
• Angle
• Opposite rays
• Intersection
• Parallel lines
• Transversal
• Line bisector
• Perpendicular bisector
• Coplanar
• Collinear points
• Plane