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Posted by on Saturday, December 12, 2009 at 5:39pm.

Fred was measuring the height of a building. He stood standing at some distance from
the building and measured an angle of 38 degrees to the top of the building. He then
walked 100 feet further away from the building and measured an angle of 34 degrees to
the top.
How tall is the building?

I know I'm suppose to use tan

I got tan38=y/x from the first part of the information. I need help getting the second part

  • Math - , Saturday, December 12, 2009 at 7:04pm

    from the outer triangle
    tan 34 = y/(x+100)
    y = (x+100)tan 34

    from your equation
    y = xtan 38

    so xtan 38 = (x+100)tan 34
    xtan 38 = xtan 34 + 100tan 34
    xtan 38 - xtan 34 = 100tan 34
    x(tan 38 - tan 34) = 100tan 34
    x = 100tan 34/(tan 38 - tan 34)

    once you found x, you can find y using your first equation.

  • Math - , Monday, January 12, 2015 at 8:32pm

    you should help me mines is kinda like that and i don't understand it

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