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Math Help - Calculus word problem - dont know where to start

  1. #1
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    Calculus word problem - dont know where to start

    A fence 2 feet tall runs parallel to a tall building at a distance of 6 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

    I am unsure what to do. my teacher helped me and said the length is 2 csc theta + 6 sec theta but i do not know where to go with this. please help thanks
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  2. #2
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    If the length is that (I didn't check it) then you should find it's minimum with respect to theta as they are asking for the shortest ladder.
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  3. #3
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    yes but how do i go about doing that
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