Question

x° 78° 52° o x = 52 o x = 39 o x = 44 o x = 50

Explanation:

Step1: Recall angle - sum property

The sum of interior angles of a triangle is $180^{\circ}$. So, $x + 78+52=180$.

Step2: Solve for x

$x=180-(78 + 52)$. First, calculate $78 + 52=130$. Then, $x=180 - 130=50$.

Answer:

$x = 50$