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anonymous

  • 5 years ago

Peter (P) and Jamie (j) have computer factories that are 132 miles apart. They both ship their completed computer parts to Diane(d) . Diane is 72 miles from peter and 84 miles from jamie. using points d,j,and p to form a triangle, fine pdj to the nearest ten minutes or nearest tenth of a degree. what is cos132?

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  1. anonymous
    • 5 years ago
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    -.669

  2. amistre64
    • 5 years ago
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    -.669 dosnt look to be a correct answer :)

  3. amistre64
    • 5 years ago
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    maybe for cos132, but that seems spurious at best

  4. anonymous
    • 5 years ago
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    Person ask what cos 132 is, so I answer cos 132

  5. amistre64
    • 5 years ago
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    yeah, i see that :) but i think the cos132 might be wrong for the solution...gonna need to verify it

  6. amistre64
    • 5 years ago
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    we can modify the law of cosines to find the angle they are looking for

  7. amistre64
    • 5 years ago
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    132^2 = 84^2 + 72^2 -2(84)(72) cos(t); solve for t

  8. amistre64
    • 5 years ago
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    132^2 - 84^2 -72^2 ------------------- = cos(t) -2(84)(72)

  9. amistre64
    • 5 years ago
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    the angle asked for is the cos^-1 of that

  10. anonymous
    • 5 years ago
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    THAT SO COOL! :D What you did with division sign! :D I no think taht way! :D

  11. amistre64
    • 5 years ago
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    (132^2 - 84^2 -72^2)/(-2(84)(72)) = -0.428571429 t = 115.3769.... :)

  12. amistre64
    • 5 years ago
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    i find that way is alot clearer and faster than fighting the editor

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