### Home > PC > Chapter 2 > Lesson 2.3.4 > Problem2-119

2-119.

Use the triangle to answer the problems below.

1. Find the exact lengths of the missing sides.

Find the 3rd angle.
Then use the Law of Sines to find the other sides.

2. Write and simplify the cosine ratio for $∠A$.

$\text{Cos}A=\frac{\text{adjacent side}}{\text{hypotenuse}}$

3. Write and simplify the sine ratio for $∠A$.

$\text{Sin}A=\frac{\text{opposite side}}{\text{hypotenuse}}$