Constructing a line perpendicular to a given line and through a point not on the line is one of the most important constructions in geometry. This process is known as dropping a perpendicular, because ...

Drag points A, B, and P to change the relationship between these points. Use the buttons, in order, to demonstrate how a line is constructed perpendicular to a given line and through a given point.

A line which cuts another line into two equal parts and meets it at a right angle is called a perpendicular close perpendicularPerpendicular lines are at 90° (right angles) to each other ...

The basic geometry elements include lines and angles — that is, lengths and midpoints, vertical angles, and parallel and perpendicular lines — triangles and other polygons, circles and solids ...