For this exercise, we only need to consider three of the points, two of the rays, and the protractor. Let's remove the rest so that it is easier to view.
By looking at the numbers on the protractor's curved section, we can see that on the inner scale HM passes through 145^(∘) and HK through 55^(∘). According to the Protractor Postulate, the measure of ∠MHK is equal to the absolute value of the difference between these two values.
m∠MHK = |145^(∘) - 55^(∘)| = 90^(∘)
Now, we can classify the angle using its measure.
