Two angles of a triangle are equal and the third angle measures 78°. What is the measure of each of the unknown angles?
Answer & explanation
Correct answer: option 2
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 \({51}^\circ\).