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system
calculate the area of a trapezoid with vertex coordinates a(-2, 5), b(-7, 9), c(-1, 13), and d(-3, 10).
user
the area of the trapezoid can be calculated using the formula a=0.5 * (sum of the lengths of the parallel sides) * (distance between the parallel sides). the lengths of the parallel sides are (5-9) and (13-10) and the distance between the parallel sides is (7-(-2)) = 9, so we get a = 0.5 * (4 + 3) * 9 = 40.5. therefore, the area of the trapezoid is 40.5.
assistant