JBMO-SL 2002 Problem 11

Let $ABC$ be an isosceles triangle with $AB=AC$ and $\angle A=20^\circ$ . On the side $AC$ consider point $D$ such that $AD=BC$ . Find $\angle BDC$ .

Dataset text AI-MO AoPS. Quoted with source.

Solutions

No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.