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anonymous

  • one year ago

help lease

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    do you know law of cosine?

  3. anonymous
    • one year ago
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    no i dont :{

  4. anonymous
    • one year ago
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    wait what

  5. welshfella
    • one year ago
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    i'm trying to use the equation editor but failing...

  6. welshfella
    • one year ago
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    the cosine rule when applied here is 2^2 = 3^2 + 4^2 - 2.3.4 cos theta

  7. welshfella
    • one year ago
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    so you now need to solve for 2.3.4 cos theta

  8. anonymous
    • one year ago
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    how

  9. welshfella
    • one year ago
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    well use the rules of algebra

  10. welshfella
    • one year ago
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    subtract 3^2 + 4^2 from both sides then multiply through by -1

  11. anonymous
    • one year ago
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    -24 ?

  12. welshfella
    • one year ago
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    2^2 - 3^2 - 4^2 = 3^2 + 4^2 - 3^2 - 4^2 - 2.3.4 cos theta so the 3^2 and 4^2 disappear from the right side

  13. welshfella
    • one year ago
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    can you continue? No its not -24

  14. anonymous
    • one year ago
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    oh wait is it 21

  15. welshfella
    • one year ago
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    yea

  16. welshfella
    • one year ago
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    -21 = - 2.3.4 cos theta multiply both sides by -1 21 = 2.3.4 cos theta

  17. anonymous
    • one year ago
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    k thanx

  18. welshfella
    • one year ago
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    yw

  19. welshfella
    • one year ago
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    the cosine rule is used if you know 2sides of a triangle and included angle or 3 sides and you require on of the angles. It can be applied to all triangles.

  20. welshfella
    • one year ago
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    |dw:1435914229839:dw|

  21. welshfella
    • one year ago
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    c^2 = a^2 + b^2 - 2ab cos C

  22. anonymous
    • one year ago
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    oh i see thnx..again

  23. welshfella
    • one year ago
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    no probs

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spraguer (Moderator)
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