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Abbie23

Find the length of a if the measure of angle A equals 62 degrees b = 15, and c = 21.

  • one year ago
  • one year ago

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  1. some1
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    |dw:1338954330473:dw|

    • one year ago
  2. some1
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    Do you know if one of the angles are 90 degrees? I mean in the problem, not in the picture i just drew.

    • one year ago
  3. Abbie23
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    Idts

    • one year ago
  4. Cortegu10
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    i seen this prob before

    • one year ago
  5. some1
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    ok then i'm not sure. Because you can use sin, cos, tan only when it's a right triangle. sorry :(

    • one year ago
  6. Abbie23
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    It's okay!

    • one year ago
  7. dpaInc
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    |dw:1338954774600:dw|

    • one year ago
  8. dpaInc
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    do you know the law of cosines?

    • one year ago
  9. AravindG
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    ya use law of cosines

    • one year ago
  10. Abbie23
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    Yes, it's Law of Cosines problem

    • one year ago
  11. Cortegu10
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    use law of sine here

    • one year ago
  12. dpaInc
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    a^2 = 21^2 + 15^2 - 2*21*15cosA

    • one year ago
  13. AravindG
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    \[\huge \cos A =\frac{b^2+c^2-a^2}{2bc}\]

    • one year ago
  14. Abbie23
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    Ok!

    • one year ago
  15. AravindG
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    :)

    • one year ago
  16. AravindG
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    no rewards?

    • one year ago
  17. Abbie23
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    Everyone gets one!

    • one year ago
  18. AravindG
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    bt i didnt get any medals :(

    • one year ago
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