MathDB
Stewart (2023 HMMT February Geo #8)

Source:

February 20, 2023
HMMT

Problem Statement

Let ABC\triangle ABC be a triangle with BAC>90\angle BAC>90^{\circ}, AB=5AB=5 and AC=7AC=7. Points DD and EE lie on segment BCBC such that BD=DE=ECBD=DE=EC. If BAC+DAE=180\angle BAC+\angle DAE=180^{\circ}, compute BCBC.