Площадь параллелограмма ABCD равна 104. Точка Е середина стороны АВ. Найдите площадь трапеции DAEC.

The area of triangle ADE is 1/4 of the area of parallelogram ABCD because E is the midpoint of AB and the height is the same. Area(ADE) = 104 / 4 = 26.

The area of triangle BCE is also 1/4 of the area of parallelogram ABCD. Area(BCE) = 104 / 4 = 26.

The area of trapezoid DAEC is the area of the parallelogram minus the area of triangle BCE. Area(DAEC) = 104 - 26 = 78.