Respuesta :

D4B3STP30P1E
The answer is 30°.
Rule: All three sides must add up to 180°. 
Since A=60 and the side vertical to the angle which is 90° then side C would be C=90° and that adds up to 150°, so you can conclude that angle B is 30°.
I hope I helped!
lolurnotaburger
I agree with the person that answered before me. 

You shall make them brainliest!

That sounded like it was from medieval.

IGNORE THIS.