We want to find the value of x in the given triangle.
To do so, we will first recall a key piece of information!
Exterior Angles of a Triangle
The measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles.
With this rule, we can write an equation in terms of x.
120^(∘)= x^(∘)+ 58^(∘)
Now, we can solve this equation for x. For simplicity, we will not include the degree symbol.
