Answer:
\(KL
Step-by-step explanation:
In a triangle there's an specific relation between angles and sides.
Specifically, the greats an angle is, the greatest is its opposite side.
So, in this case \(45\° < 57\° < 78\°\) by givens.
Now, the opposite side of each angle is
\(45\°:KL\\57\°:JL\\78\° : JK\)
This means that the order of sides from shortest to longest is
\(KL
Because the least angle has the shortest opposite side and the greatest angle has the longest opposite side.
