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anonymous

  • one year ago

~*~*~help please!! 10 points n medal!!~*~*~ Find the measure of angle A (image below). Round the answer to the nearest tenth. A. 49.5° B. 53.1° C. 63.4° D. 66.4°

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  1. misty1212
    • one year ago
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    hi!!

  2. misty1212
    • one year ago
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    is it a law of sines question? or law of cosines?

  3. anonymous
    • one year ago
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    cosines! my computer is whack and notloading up anything

  4. misty1212
    • one year ago
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    you got all 3 sides labelled?

  5. anonymous
    • one year ago
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  6. anonymous
    • one year ago
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    there we go! thank you!

  7. misty1212
    • one year ago
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    \[4^2=2^2+5^2-2\times 5\times \cos(A)\]

  8. misty1212
    • one year ago
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    so \[16=29-10\cos(A)\]

  9. misty1212
    • one year ago
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    first we get \(\cos(A)\) by itself, then A

  10. misty1212
    • one year ago
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    \[\cos(A)=\frac{13}{10}=1.3\]hmm made a mistake somewhere

  11. anonymous
    • one year ago
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    hey sorry, i dont have a calculator, give me a minuet to look

  12. misty1212
    • one year ago
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    oh doh

  13. misty1212
    • one year ago
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    \[2\times2\times 5=20\]

  14. anonymous
    • one year ago
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    no batteries ):

  15. misty1212
    • one year ago
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    \[4^2=2^2+5^2-2\times 5\times2\times \cos(A)\]\[16=29-20\cos(A)\] so \[\cos(A)=\frac{13}{20}=.65\]

  16. misty1212
    • one year ago
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    lol use wolfram

  17. misty1212
    • one year ago
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    \[A=\cos^{-1}(.65)\]

  18. misty1212
    • one year ago
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    here http://www.wolframalpha.com/input/?i=arccos%28.65%29

  19. anonymous
    • one year ago
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    0.863212!

  20. misty1212
    • one year ago
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    look at the degree answer since your answers are in degrees

  21. misty1212
    • one year ago
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    you see it?

  22. anonymous
    • one year ago
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    i am unsure of how to get the degree! im sorry

  23. misty1212
    • one year ago
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    look at the link i sent it is right there

  24. anonymous
    • one year ago
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    49.46! thank you

  25. misty1212
    • one year ago
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    i typed in \(\arccos(.65)\) in to wolfram, it gives the answer in radians and also in degrees

  26. misty1212
    • one year ago
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    \[\color\magenta\heartsuit\]

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