Solve the Problem
-Let Angle POQ Be Designated $\theta$ Angles $\mathrm { PQR }$

Multiple Choice

Solve the problem
-Let angle POQ be designated $\theta$ . Angles $\mathrm { PQR }$ and VRQ are right angles. If $\theta = 50 ^ { \circ }$ , find the length of US accurate to four decimal places.

A) $0.7660$
B) $0.8391$
C) $1.1918$
D) $1.5557$