add the answer choices together and see if it equals 70° if it equals 70° it is a possible measure.
Step-by-step explanation:
Lets say angle the angle that measures 110° is angle A all triangles have to have 3 angles that add to 180° so you can do 180°-110° to see how the amount the other 2 angles add to. the other 2 angles have to add to 70°
