midpoint theorem

Proper noun

 * 1) A theorem stating that if the midpoints of two sides of a triangle are connected, the resulting line segment will be parallel to the third side and have half of its length.
 * 2) A theorem stating that the midpoints of parallel chords in a conic are located on a common line.
 * 1) A theorem stating that the midpoints of parallel chords in a conic are located on a common line.