How to calculate the distance between the first and third islands? (Physics)

Question

I used B = -9.616 + 2.01(8.51) and got 7.4891 km , but it was incorrect.

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Answer 1 · 2018-02-05T03:41:01

$b=6.973835$ $Km$

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Law of sines:

$sin42.5/5.65=sin56.5/(AC)$

$AC=(5.65sin56.5)/sin42.5=6.973835$ $Km$