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pablobegins

Need help learning how to apply the law of sines

  • 2 years ago
  • 2 years ago

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

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

    • 2 years ago
  5. 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 ....

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

    • 2 years ago
  7. 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

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

    • 2 years ago
  9. 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)

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

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

    • 2 years ago
  12. 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

    • 2 years ago
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