Question

Question was provided via image upload.

Explanation:

Step1: Recall the sum of interior angles of a triangle

The sum of interior angles of a triangle is \(180^{\circ}\).

Step2: Set up the equation

Let the unknown angle be \(x\). Then \(x + 20^{\circ}+130^{\circ}=180^{\circ}\).

Step3: Solve the equation

$$
LATEXBLOCK0
$$

Answer:

\(30^{\circ}\)