This type of problem involves relationships among the lengths of the sides and

height as well as the area, and

perimeter of a trapezoid. Since the

height is

perpendicular to both parallel bases, it is often possible to form a

right triangle and use the

Pythagorean Theorem to calculate missing measurements. Remember that sometimes there is not enough information given to find the perimeter. While the bases and

height do determine the area, there are infinitely many trapezoids with the same bases and height, but different non-parallel sides.