For this case, we have that the area of the surface of the figure shown is given by:
: The area of the upper rectangle (inclined)
: The area of the two triangles.
: The area of the base of the prism
: The area of the rear rectangle
We apply Pythagoras to know the length of the inclined side of the rectangle:

Thus, the
is given by:

We look for the area given by the triangles, knowing that the area of a triangle is
, then:

We look for the area of the base of the prism:

We look for the area of the posterior rectangle:

Adding we have:

Answer:
