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anonymous

  • 5 years ago

Can anyone help me with this problem? "You are traveling in a car toward a certain mountain at a speed of 80 km/hr. Your viewing angle to the mountain is 0.5 degrees. Fifteen minutes later, the same mountain has a viewing angle of 1 degree. About how tall is the mountain?

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  1. anonymous
    • 5 years ago
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    okay did you start this problem

  2. anonymous
    • 5 years ago
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    I tried, but I don't think I am doing this right. All I have is that the ship traveled 20 km in 15 minutes.

  3. anonymous
    • 5 years ago
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    was there some picture that came with this problem? I am having trouble understanding what 'viewing angle' means.

  4. anonymous
    • 5 years ago
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    Well I had to draw this diagram. It's a basic right triangle with the mountain as perpendicular to the ground and the distance away as a leg. Then there is a hypotneuse. The viewing angle is the number of degrees above the horizontal. Sorry I am terrible at explaining but I hope you understand what I did.

  5. anonymous
    • 5 years ago
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    I got it thanks

  6. anonymous
    • 5 years ago
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    okay :) thanks

  7. anonymous
    • 5 years ago
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    Have you learn law of cosine and law of sine yet?

  8. anonymous
    • 5 years ago
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    Yeah sin theta = y/r and cos theta = x/r right?

  9. anonymous
    • 5 years ago
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    no that's just sine and cos(only used in right triangle) Law of sine and cosine can be used in any triangle http://en.wikipedia.org/wiki/Law_of_cosines

  10. anonymous
    • 5 years ago
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    oh okay I get it

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spraguer (Moderator)
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