Question
Two boats leave whitby harbour at the same time one boat heads 18 km to it's destination and the other boat heads 11 km to its destination. If the boats headed on a course 70 degrees apart, what is the distance between the boats ?
Answers
use the law of cosines:
d^2 = 18^2 + 11^2 - 2(18)(11)cos 70°
d^2 = 18^2 + 11^2 - 2(18)(11)cos 70°
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