A trapezoid is a quadrilateral with exactly one pair of parallel sides.
Formula for area:
In this formula, the bases are the parallel sides.
Now plug the information into the formula.
.
Follow your order of operations, simplify inside the parentheses first.
.
(1/2)(8) is 4 so we have (4)(9) which is 36.
So the area of the trapezoid is 36.