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A triangle's six basic parts are its three angles and three sides.
The triangle's median is the length of line that joins the vertex of one triangle to the midpoint of the other.
Triangle ABC's median is represented by AM in the above figure.
A triangle contains three medians.
The triangle's height, or altitude, is the perpendicular line segment that joins the triangle's vertex to its opposite side.
The triangle XYZ's altitude (height) is represented by XM in the accompanying picture.
A triangle has three levels of elevation.
