Two swimmers part at a beach. One swims at 8 km/hr and the other at 6km/hr. After one hour the
swimmers are 4.5 km apart. What was the original angle at which the swimmers left each other?
a) Which formula would you use to solve for the triangle below and why?
b) Determine the angle at which the swimmers left each other.
use the law of cosines to find the angle between two sides
4.5^2 = 6^2 + 8^2 - 2*6*8 cosθ