Posted by Ashley on Sunday, November 18, 2012 at 11:38pm.
It is 4.7km from Lighthouse A to Port B. The bearing of the port from the lighthouse is N73E. A ship has sailed due west from the port and its bearing from the lighthouse is N31E. How far has the ship sailed from the port?

trig  Steve, Monday, November 19, 2012 at 10:19am
If the ship has sailed to point C,
angle A = 73°31° = 42°
angle B = 17°
so, angle C is 121°
the distance AC is side a, where
a/sin42° = 4.7/sin121°
a = 3.67
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