Math (trigonometry)

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Homework Help: Math (trigonometry)
Posted by Sammy on Monday, December 3, 2012 at 4:25pm.


 From a boat on the water, the angle of elevation of the top of a cliff is 31°. From a point 300 m closer, the angle of elevation is 33°. Find the height of the cliff. 

the answer should be 2411 m. 

I had tan31° = h/x+(x-300) 
tan33° = h/x-300 -> (x-300)tan33° = h. 

I subbed the first one into the second: 
tan31° = (x-300)tan33°/x+x-300 

I'm not sure how to go from there or if what I have so far is even right.

  • Math (trigonometry) -

    tan 33 = h/x

    tan 31 = h/(x+300)
    so
    h = x tan 33 = .649 x
    then
    tan 31 = .649 x/(x+300)

    (x+300)(.601) = .649 x
    x + 300 = 1.08 x

    .08 x = 300
    x = 3750
    h = .649 x = 2433

    Carry more significant figures than I did. When you do the 1.08 - 1 you lose a lot of accuracy

  • Math (trigonometry) -

    yes i want to do the things very much

  • Math (trigonometry) -

    NO

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