Use the given scale factor and the side lengths of the scale drawing to determine the side lengths of the real object.
Scale factor: 2:1
5 in
10 in
c
13 in
Scale drawing
Object

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.