Question

4 find the missing angle

Explanation:

Step1: Recall angle - sum property

The sum of interior angles of a triangle is $180^{\circ}$. So, $x + 91^{\circ}+ 39^{\circ}=180^{\circ}$.

Step2: Simplify the left - hand side

$x+(91 + 39)^{\circ}=180^{\circ}$, which gives $x + 130^{\circ}=180^{\circ}$.

Step3: Solve for x

Subtract $130^{\circ}$ from both sides: $x=180^{\circ}-130^{\circ}$, so $x = 50^{\circ}$.

Answer:

$x = 50^{\circ}$