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pablobegins

  • 4 years ago

Need help learning how to apply the law of sines

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  1. pablobegins
    • 4 years ago
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  2. pablobegins
    • 4 years ago
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  3. amistre64
    • 4 years ago
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    first off, what is the law of sines tell us?

  4. pablobegins
    • 4 years ago
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    that a/sinA is equal to b/sinB equal to c/sinC

  5. amistre64
    • 4 years ago
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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 ....

  6. pablobegins
    • 4 years ago
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    what would we use?

  7. amistre64
    • 4 years ago
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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

  8. pablobegins
    • 4 years ago
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    104tan(72)?

  9. amistre64
    • 4 years ago
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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)

  10. amistre64
    • 4 years ago
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    tan(a) = w/l l tan(a) = w yeah

  11. amistre64
    • 4 years ago
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    the tangent method is much simpler by far

  12. pablobegins
    • 4 years ago
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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

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