AMO 2027 Grades 8-9 SET 18 - Self-study Question 14

Question 32. In the figure, $\angle A$, $\angle B$, and $\angle C$, are right angles. If $\angle AEB=40^\circ$ and $\angle BED=\angle BDE$, then $\angle CDE=$

**Editorial input convention:** Planned revision repeat from SET 5. Use the ray positions and collinearities in the retained source figure.