Altitude of a Triangle
Height of a Triangle
The distance between a vertex of
a triangle and the opposite
side. Formally, the shortest line
segment between
a vertex of a triangle and the
(possibly extended) opposite side. Altitude also refers to the
length of this segment.
Note: The
three altitudes of a triangle are concurrent,
intersecting at
the orthocenter.
See
also
Base
of a triangle, centers
of a triangle
