Three oil platforms, Alpha, Beta and Gamma
are situated in the North Sea.Beta is 12 km from Alpha and is on a bearing of 145 degrees from Alpha.Gamma is 16 km from Alpha and is on a bearing of 220 degrees from Alpha.Find the distance of Beta from Gamma.
(Not sure how to approach this question)
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draw a diagram. Use the law of cosines, since you have two sides and the angle between them.
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