### Home > PC3 > Chapter 3 > Lesson 3.2.3 > Problem 3-127

3-127.

If

Draw and label a right triangle in the correct quadrant.

Calculate the length of the unknown side.

(Or you may know it because it is a Pythagorean Triple!) When you label it, think about if it should be positive or negative.

From the side lengths, you can determine cos(*θ*) and tan(*θ*).