A. Given: ABC … In the accompanying diagram, CD is an altitude of ^ABC. Which statement will always be true? Which could not be a measure of an exterior angle of the triangle? In the accompanying diagram, OACD is an exterior angle of ^ABC, mOA= 3x, mOACD= 5x, and mOB = 50. 46.5 C. 56 D. 83 8. 1) m∠B =m∠A 2) m∠A >m∠B 3) m∠A =m∠C 4) m∠C