Posted by **Danielle** on Thursday, February 14, 2013 at 2:16pm.

a lighthouse is located at point A. a ship travels from point B to point C. At point B,, the distance between the ship and the lighthouse is 7.5km. At point C the distance between the ship and the lighthouse is 8.6km. Angle BAC is 58 degrees. Determine the distance between B and C.

- trig -
**Steve**, Thursday, February 14, 2013 at 4:34pm
This is just a straightforward law of cosines problem. We want to find a, given A,b,c.

A=58°, c=7.5, b=8.6

a^2 = b^2+c^2 - 2bc cosA

plug and chug. . .

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