This is using Cosine Law. Two pirate ships, A and B, lie 125m apart on the ocean's surface. There is a treasure chest, C, on the ocean floor. The angle of depression from A is 60 degrees and the distance from A to C is 80m. Calculate the distance from B to C.

Elementary Geometry for College Students
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Author:Daniel C. Alexander, Geralyn M. Koeberlein
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Chapter8: Areas Of Polygons And Circles
Section8.4: Cicumference And Area Of A Cicle
Problem 15E
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This is using Cosine Law.

Two pirate ships, A and B, lie 125m apart on the ocean's surface. There is a treasure chest, C, on the ocean floor. The angle of depression from A is 60 degrees and the distance from A to C is 80m. Calculate the distance from B to C. 

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