pablobegins
Need help learning how to apply the law of sines
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pablobegins
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pablobegins
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amistre64
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first off, what is the law of sines tell us?
pablobegins
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that a/sinA is equal to b/sinB equal to c/sinC
amistre64
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right, but i dont see how that would help us in this problem; we only know one angle and one distance ....
pablobegins
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what would we use?
amistre64
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id use a tangent myself; but i might see a way for the law of sines to work out ... if need be
pablobegins
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104tan(72)?
amistre64
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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)
amistre64
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tan(a) = w/l
l tan(a) = w
yeah
amistre64
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the tangent method is much simpler by far
pablobegins
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thank you! you might wanna see my other questions that i'll post in a bit- they're all related to trig