Total Surface Area = ?
2 in
5 in
6 in

P.S: Your question is incomplete. Please consider attaching a picture to your question.

Step-by-step explanation:

We know that:

Solution:

Hence, the surface area of the rectangular prism is 104 in.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.