# Chapter 6 - Section 6.1 - The Law of Sines - Exercise Set - Page 723: 70

See explanations.

#### Work Step by Step

With a known boat speed and an angle measuring device, at $t=0$, measure the angle of the lighthouse with respect to the boat path. After some time interval $\Delta t$, measure the angle again. The distance traveled will be the product of speed and time. Thus, with known $ASA$, we can solve the triangle, which gives the distance from the boat to the lighthouse.

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