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

$b = 6.973835$ $b=6.973835$ $K m$ $Km$

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Law of sines:

$\frac{sin 42.5}{5.65} = \frac{sin 56.5}{A C}$ $sin42.5/5.65=sin56.5/(AC)$

$A C = \frac{5.65 sin 56.5}{sin 42.5} = 6.973835$ $AC=(5.65sin56.5)/sin42.5=6.973835$ $K m$ $Km$