Context: $RT = TU$, angle $VST = 23°$, angle $RVS = 34°$. Find $x$ at $T$.

Answer: $158$

Why: In $\triangle UVS$: $\theta + (180-34) + 23 = 180$, so $\theta = 11°$. Isosceles $\triangle RTU$: $x = 180 - 2(11) = 158$.

Traps: Forgetting supplementary angle at $V$ ($180 - 34 = 146$). Confusing which angle is given.