If m∠A = 110 degrees and m∠B = 35 degrees, find m∠1.

110 + 35 + x = 180: x = 35. i think in your question m<1 is outside the triangle as an exterior angle so the answer would be 180 - 35 = 145. hence 145 is your answer if your m, 1 is outside the triangle as an exterior angle.