Draw the height of the parallelogram DO, as shown in the figure. The area of the parallelogram is equal to the product of the side by the height of the parallelogram.
S parallelogram = BC * h = 5
And the area of the trapezoid is equal to the product of half the sum of the bases by height.
S trapezoid = h * (BC + AE) / 2.
AE = AD / 2 (by the condition of the problem).
AD = BC (according to the parallelogram property).
Therefore, AE = BC / 2.
Then S trapezoid = h * (BC + BC / 2) / 2 = h * (3 * BC / 2) / 2 = h * 3 * BC / 4 = h * BC * 3/4 = S paralma * 3 / 4 = 5 * 3/4 = 3.75.
Answer: S trapezoid = 3.75
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