### Home > GC > Chapter 5 > Lesson 5.3.4 > Problem 5-100

Draw a diagram of this situation. Label all of the sides and angles that Farmer Jill has measurements for.

Find the length of the fence that needs to be replaced. Show all work. Which tool did you use?

Use the Law of Cosines,

. The angle that you know has to correspond to , so that you can calculate .