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


If  and , sketch a triangle to match this situation and then evaluate and .  

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).

Coordinate graph, with right triangle in third quadrant, horizontal leg, is negative x axis, vertical leg labeled, 5, hypotenuse, labeled 13.