Find the surface area of the figure below.

The pyramid given above has four faces. Each of which are in triangular shape. The area of the triangle is calculated through the equation,

                       A = bh / 2
where A is area, b is base and h is the height. 

Substituting the known values,

                      A = (4 inch)(9 inch) / 2 = 18 in²

Multiplying this area by 4 will give us an answer of 72 in².

Then, we also calculate for the area of the square base.
                      A = s²
where s is the measure of each side of the square.

                       A = (4 in)² = 16 in²

Finally, we add up the calculated areas.
                  surface area = 72 in² + 16 in²
                      surface area = 88 in²

Hence, the surface area of the figure is equal to 88 in².