It works because a trapezoid is made up of two triangles , both with the same altitude, that altitude being the height of the trapezoid. If the bases ( i.e parallel sides are a and b and the height is h. one triangle has area 1/2ah and the other 1/2 bh so the total area is
1/2ah+ 1/2bh = 1/2h(a+b).
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You need to use BODMAS whenever you evaluate ANY formula.
Add the four sides.
1/2h(b1+b2) =D
Area = base*height
The answer depends on what x is. And also, it is a trapezoid, not trapizoid!