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Abbie23 Group Title

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

  • 2 years ago
  • 2 years ago

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  1. some1 Group Title
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    |dw:1338954330473:dw|

    • 2 years ago
  2. some1 Group Title
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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.

    • 2 years ago
  3. Abbie23 Group Title
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    Idts

    • 2 years ago
  4. Cortegu10 Group Title
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    i seen this prob before

    • 2 years ago
  5. some1 Group Title
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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 :(

    • 2 years ago
  6. Abbie23 Group Title
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    It's okay!

    • 2 years ago
  7. dpaInc Group Title
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    |dw:1338954774600:dw|

    • 2 years ago
  8. dpaInc Group Title
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    do you know the law of cosines?

    • 2 years ago
  9. AravindG Group Title
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    ya use law of cosines

    • 2 years ago
  10. Abbie23 Group Title
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    Yes, it's Law of Cosines problem

    • 2 years ago
  11. Cortegu10 Group Title
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    use law of sine here

    • 2 years ago
  12. dpaInc Group Title
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    a^2 = 21^2 + 15^2 - 2*21*15cosA

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

    • 2 years ago
  14. Abbie23 Group Title
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    Ok!

    • 2 years ago
  15. AravindG Group Title
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    :)

    • 2 years ago
  16. AravindG Group Title
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    no rewards?

    • 2 years ago
  17. Abbie23 Group Title
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    Everyone gets one!

    • 2 years ago
  18. AravindG Group Title
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    bt i didnt get any medals :(

    • 2 years ago
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