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 Everyday Examples
 Altitude of a Triangle:  The perpendicular distance between a vertex of a triangle and the side opposite that vertex. Sometimes called the height of a triangle. Also, sometimes the line segment itself is referred to as the altitude.


Image sources: http://acept.la.asu.edu/courses/phs110/expmts/exp6/sail.jpg

The mast of a ship is an altitude that holds the sails in place.