User:Atcovi/Geometry4

Preperations for test on 2/13/2018

 * User:Atcovi/Geometry3
 * 5 ways to prove a quadrilateral a parallelogram:
 * Show that both pairs of opposite sides are parallel.
 * Show that both pairs of opposite sides are congruent.
 * Show that one pair of opposite sides are both congruent and parallel.
 * Show that both pairs of opposite angles are congruent.
 * Show that the diagonals bisect each other.
 * Median of triangle formula: $$2(median)$$