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 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.

Altitude to the Hypotenuse: Find as many as possible proportions that exist in a given situation.

In or Out?: Determine the location of the altitudes in a triangle.

Area Formulas: Investigate the area of triangles in a variety of ways.