IKMC 2014 - Grades 7-8 - Self-study Question 16

Question 16

In triangle ABC, BH is a perpendicular height and AD bisects angle A. The obtuse angle between BH and AD is four times angle DAB, as shown. What is angle CAB?

Question illustration

$30^\circ$
$45^\circ$
$60^\circ$
$75^\circ$
$90^\circ$