Respuesta :
I think that the answer would be 56 since if you unfold a triangle it would all equal 180 so you just have to add both given angles and then subtract that answer from 180.. if its wrong im sorry :)
if a triangle has 180 degrees, and a right angle is 90 degrees and another is 34 degrees, we can us the expression... 180 - 90 - 34 = your mystery angle
56 degrees is the 3rd angle
56 degrees is the 3rd angle