Area is 5 1/4 in ^2 or 5.25 in^2
Workup in picture below
Good luck
Answer:

Step-by-step explanation:
<u>Step 1: Determine the area of the bottom rectangle</u>



<u>Step 2: Determine the area of the back rectangle</u>



<u>Step 3: Determine the area of the top rectangle</u>



<u>Step 4: Determine the area of the triangle</u>




<u>Step 5: Determine the surface area</u>


Answer: 
By the Pythagoras theorem:-
h^2 = x^2 + x^2
(where h = hypotenuse)
h^2 = 2x^2
h = sqrt2 x
Example: (1/5)/(4/13)=(1/5)*(13/4)=13/20