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Need help learning how to apply the law of sines

Mathematics
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first off, what is the law of sines tell us?

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Other answers:

that a/sinA is equal to b/sinB equal to c/sinC
right, but i dont see how that would help us in this problem; we only know one angle and one distance ....
what would we use?
id use a tangent myself; but i might see a way for the law of sines to work out ... if need be
104tan(72)?
the angle on the other side of the river is 90 minus the angle on this side: 90-a and we know the distance on this side as: l sin(90-a) sin(a) -------- = ----- l w w = l sin(a)/sin(90-a)
tan(a) = w/l l tan(a) = w yeah
the tangent method is much simpler by far
thank you! you might wanna see my other questions that i'll post in a bit- they're all related to trig

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