Altitude in a Triangle

Definition: an altitude is a segment from the vertex of a triangle to the opposite side and it must be perpendicular to that segment (called the base).

As the picture below snows, sometimes the altitude does not directly meet the opposite side of the triangle. Instead, the altitude intersects the projection of the opposite side.

Altitude Applet

(Applet on its own page) Explore the altitude and base of triangles with this interactive applet

Choose Base
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