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anonymous

  • one year ago

An observer (O) spots a bird flying at a 55° angle from a line drawn horizontal to its nest. If the distance from the observer (O) to the bird (B) is 15,000 ft., how far is the bird (B) from its nest (N)? Round to the nearest whole number. These are the choices: A) 8,604 Feet B) 12,287 Feet C) 18,366 Feet D) 21,422 Feet

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    I'd like to learn this please, not just get the answer! :)

  3. anonymous
    • one year ago
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    I know the functions by the way.

  4. welshfella
    • one year ago
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    angle = 55 degrees side adjacent to the angle (A) = x hypotenuse (H) = 15,000 so which trig ratio do we require?

  5. anonymous
    • one year ago
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    The cosine function?

  6. welshfella
    • one year ago
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    by trig ratio i mean trig function

  7. welshfella
    • one year ago
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    yes

  8. anonymous
    • one year ago
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    Okay, so the first step would be: cos55 = x/15,000 ??

  9. welshfella
    • one year ago
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    that correct

  10. anonymous
    • one year ago
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    Okay, then you'd do cos 55 into the calculator which gives you: 0.57357. Then I'd multiple 15,000 into 0.57357?

  11. anonymous
    • one year ago
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    yep!

  12. anonymous
    • one year ago
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    Which will be: 8603.55 which rounds to 8604 which is A. :)

  13. welshfella
    • one year ago
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    yes

  14. anonymous
    • one year ago
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    Okay, thank you haha! :)

  15. anonymous
    • one year ago
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    Looks like you hardly need any help champ!

  16. welshfella
    • one year ago
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    well done

  17. anonymous
    • one year ago
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    Wanted to make sure I was correct lol.

  18. welshfella
    • one year ago
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    I don't want to appear pedantic but its more correct to say 'multiply by' than 'multiply into' - this threw me at first because you can say 'divide into'.

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