MathNet 2015-part-05 — 191 problems (EN–VI) Question 34

A triangle $ABC$ has $m(\widehat{BCA}) = 30^\circ$ and there exists a point $D \in AC$ such that $m(\widehat{DBC}) = 10^\circ$ and $AC = BD$. Find $m(\widehat{CAB})$.

Marius Stănean