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 Related Terms
 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.
Angle Bisector: A segment or ray that shares a common endpoint with an angle and divides the angle into two equal parts.
Median of a Triangle: A segment is a median of a triangle if and only if its endpoints are a vertex of the triangle and the midpoint of the side opposite the vertex.
Perpendicular Bisector: A perpendicular line or segment that passes through the midpoint of a segment.
Base (of a Polygon): For two-dimensional figures, any side can be a base. Typically, however, the bottom side, on which the polygon 'sits,' is called the base.
Triangle: A polygon with three sides.
Height of a Triangle: The length of the perpendicular segment from a vertex to the opposite side of a triangle. It is also called the altitude of a triangle.