This document defines trapezoids and isosceles trapezoids, provides constructions for drawing them using patty paper, and lists some key properties. It states that a trapezoid has one set of parallel sides, an isosceles trapezoid has congruent non-parallel sides, and consecutive angles between the bases of a trapezoid are supplementary. The bases angles of an isosceles trapezoid are congruent and its diagonals are also congruent.