Answer: First option
Step-by-step explanation:
By definition, you know that:
[tex]55\°=\frac{170\°-x}{2}[/tex]
Therefore, to calculate the measure of the missing angle, you must solve for x, as you can see below:
- Multiply both sides of the equation by 2.
- Subtract 170 from both sides of the equation.
- Multiply both sides of the equation by -1
Therefore:
[tex]55\°=\frac{170\°-x}{2}\\\\(2)55\°=\frac{170\°-x}{2}(2)\\\\110\°=170\°-x\\110\°-170\°=170\°-x-170\°\\(-1)-60\°=-x(-1)\\x=60\°[/tex]
