An obtuse angle!
It is obviously bigger than a right angle and acute angle as they’re being added.
The only two other things it can be are obtuse and reflex.
Right angles are 90°.
Acute angles are smaller than 90°.
Reflex angles are angles over 180° and below 360°.
Obtuse angles are angles larger than 90° but smaller than 180°.
If you added a right angle (90°) to an acute angle (less than 90°) you would get a number between 90° and 180°, making it obtuse :)