#### Answer

$m\angle{HAB}= 160^o$
$\angle{HAB}$ is obtuse.

#### Work Step by Step

point H is at $180^o$
point B is at $20^o$
Thus,
$m\angle{HAB} =180^o-20^o=160^o$
Obtuse angles are angles whose measure is more than 90 degrees but less than 180 degrees.
Thus, $\angle{HAB}$ is obtuse.