### Home > GC > Chapter 5 > Lesson 5.3.2 > Problem 5-80

5-80.

Find the length of *DE* = 9 units. Homework Help ✎

Use the Law of Sines. See the Math Notes box for this lesson.

Find the measure of the unknown angle.

By Law of Sines:

Solve for *x*.

5-80.

Find the length of *DE* = 9 units. Homework Help ✎

Use the Law of Sines. See the Math Notes box for this lesson.

Find the measure of the unknown angle.

By Law of Sines:

Solve for *x*.