Two angles of a triangle are equal and the third angle measures 78°. What is the measure of each of the unknown angles?

50° 51° 49° 52°

51°

Concept Used Sun of all angles of a triangle is \({180}^\circ\). Calculation Let angle 1 = angle 2 = x Now, x + x + \({78}^\circ\) = \({180}^\circ\) 2x = 180 - 78 2x = 102 x = 51 Therefore, the answer is \({51}^\circ\).