Definition: A quadrilateral with 1 pair of parallel sides.
Mid segment Theorem:
Theorem 1: Exactly 2 pairs of consecutive angles are supplementary.
mÐA + mÐB = 1800 mÐC + mÐD = 1800
Definition: A trapezoid with the opposite non-parallel sides being congruent.
Theorem 1: Base angles are congruent
Theorem 2: Diagonals are congruent
Definition: A quadrilateral where both pairs of consecutive sides are congruent, but opposite sides are NOT congruent.
Theorem 1: Diagonals are perpendicular.
Theorem 2: Exactly 1 pair of opposite angles are congruent.