1. This problem has no unique solution, because with the given conditions you can draw 6 different trapezoids.

2. See attachment: There are 2 trapezoids in red, 2 trapezoids in blue, 2 trapezoids in green.

3. Take the red trapezoids (that's the simplest case!):

Point A must be situated on a parallel to the x-axis with the equation y = 8.

The area of a trapezoid is calculated by :

,

So you have to solve for

:

which yields

So you get 2 different points A:

or

4. The next 4 trapezoids are much more difficult to determine.