### Home > A2C > Chapter 3 > Lesson 3.1.1 > Problem 3-21

3-21.

Find the length of the side labeled in each triangle below. Homework Help ✎

Look at the angle measures. Does this type of triangle look familiar?

If you cannot solve it that way, refer to problem 1-61 or the Math Notes box in Lesson 1.2.1.

Look at the values given. Is it necessary to use the trigonometric identities, or is there an easier way?

Use the Pythagorean Theorem.