Perpendicular
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Keyboard: PERPENDICULAR, PER (within a command)
Toggles the Perpendicular snap on or off. When set to ON, you can snap a new entity that you are drawing to a point perpendicular to another entity. You can snap a new entity to an arc, circle, ellipse, line, polyline, infinite line, ray, spline, hatch pattern, or plane.

- The 90-degree angle between the entity you are drawing and the existing entity.
- The entity to which you are snapping a perpendicular line.