Help find the measure of the angle indicated!!!?

Answer:
50°
Step-by-step explanation:
[tex]m\angle RST = \frac{1}{2} \times (150\degree - 50\degree) \\\\
m\angle RST = \frac{1}{2} \times 100\degree \\\\
\purple{ \bold{m\angle RST =50\degree}} \\\\[/tex]