To solve part (b) of the problem, we need to find the value of $x$ in the triangle $PQR$.

Analyzing the Triangle

1. The triangle $PQR$ has:
   • An angle $\angle QPR = x$.
   • An angle $\angle PRQ = 54^\circ$.

Since the sum of the interior angles in a triangle is always $180^\circ$, we can set up the equation:

$x + 54^\circ + \angle PQR = 180^\circ$

2. To find $x$, we need to determine the missing angle $\angle PQR$.

Solving for $x$

• Since we do not have the measurement of $\angle PQR$, we must assume the problem requires only finding $x$ in terms of the other angles provided.

Using the triangle angle sum formula:

$x = 180^\circ - 54^\circ - \angle PQR$

$x = 126^\circ - \angle PQR$

If there are any additional details about $\angle PQR$ that I missed or if you want to clarify something further, please let me know.