A straight line at right angles to another line

A Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting

A cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point

An extremely steep face

Perpendicular Gothic architecture was the third and final style of English Gothic architecture developed in the Kingdom of England during the Late Middle Ages, typified by large windows, four-centred arches, straight vertical and horizontal lines in the tracery, and regular arch-topped rectangular panelling.

Intersecting at or forming right angles

At right angles to the plane of the horizon or a base line

Extremely steep