Perpendicular to a Line
Menu: Draw / Lines / Perpendicular to a Line
Draws a line perpendicular from a point to an existing line.
Point 1: End point of perpendicular line
Point 2: Point on line to which new line is drawn perpendicular
To restrict the command in a complex drawing so that only selected lines can be used, click the Selected Entities Only option. Set one point for the location and starting point of the perpendicular line and a second point on the line to which the perpendicular line will be drawn.
NOTE: This command is similar to the Perpendicular From a Line command, but this command uses the point away from the line for the perpendicular location. Perpendicular From a Line uses the point on the existing line for the perpendicular location.