Video Tutorial Geometric Constraint Perpendicular

Geometric Constraint Perpendecular is Causes selected lines to lie 90 degrees to one another. 

This command is equivalent to the Perpendicular option in GEOMCONSTRAINT.
Lines do not have to intersect to be perpendicular.
Following are the valid constraint objects and points:

• Line
• Polyline segment
• Ellipse
• Multiline text