Start by identifying the hypotenuse of the right triangle. Then find the sides that are opposite and adjacent to ∠ C.
4/5=0.80
Practice makes perfect
For the given right triangle, we want to write the ratio for the cosine of ∠ C. Let's start by identifying the hypotenuse of the triangle and the sides that are opposite and adjacent to ∠ C.
We see that the length of the hypotenuse is 25. The length of the side adjacent to ∠ C is 20 and the length of the side opposite to ∠ C is 15. With this information, we can find the desired ratio.
