to # 2.:
since the 2 trapezoids are the halves of a regular hexagon you get:
AB = BC = AC = 9. That means triangle ABC is an equilateral triangle. Therefore the angle y = 60°.
x = AB = 9 m. See above.
If s is the side of an equilateral triangle it's area is calculated by:
. Plug in the value you know (s = 9 m).
The complete area consists of 6 triangles and 1 rectangle. Since AC = 9 m the width of the rectangle is 18 m. Thus the complete area is: