### Home > INT3 > Chapter 9 > Lesson 9.1.3 > Problem 9-34

9-34.

Yee Ping is thinking about swimming across Redleaf Lake. She knows that she can swim about *A* and *B*) and a third post as shown in the diagram at right (point *C*). Use this information to determine how far Yee Ping will have to swim across the lake. Should Yee Ping be confident that she will be able to swim across Redleaf Lake?

Use the Law of Cosines to solve for the length of the lake.

The lake is about