X = 159°
Explanation:
To find the missing angle, you must first find the sum of the interior angles. To do this, you can use the equation:
![(n - 2)180](https://img.qammunity.org/2020/formulas/mathematics/middle-school/tu8f3him3osmcdxi530804eixdq2bdikpc.png)
Let n represent the number of sides. This is a regular pentagon, therefore there are 5 sides. Your new equation is:
![(5 - 2)180](https://img.qammunity.org/2020/formulas/mathematics/middle-school/akatwdn3hhw709xwo9u3ix6l5oyfgmzjyt.png)
Once you calculate this, you will find the answer is 540°.
Next, you need to find x. To do this, first add all of your interior angles together. If you didn't know, the square is a right angle, meaning it is 90°.
![83 + 90 + 119 + 89 = 381](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ucev7pzlullpr84p6ogsucugafkfdaix57.png)
Now take 540, subtract 381, and your answer is your missing angle (x).