### Home > PC3 > Chapter 11 > Lesson 11.2.3 > Problem11-116

11-116.

Marsha and Edwin want to know how far they will have to swim to get across a small pond. They have a $100$-foot rope that they place at the waters edge (in a straight line), then standing at each end, they use a compass to measure the angle between the rope and a tree on the other side of the lake. Marsha’s angle is $67°$. Edwin’s angle is $81°$. How far will they have to swim to get to the other side of the pond?