A triangle has three altitudes so you need to be more specific. In general terms, it is a line from a vertex that meets the opposite side at right angles.
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Angle abc will form a right angle if and only if, segment ab is perpendicular to segment bc.
The segment that passes through a vertex and is perpendicular to the opposite side is called the altitude of the triangle.
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the altitude of a prism is a segment perpendicular to both bases whose endpoints are in the planes of the bases.
An altitude.