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Homework Help: Trig derivative applications answer check!

  1. Jun 1, 2010 #1
    1. The problem statement, all variables and given/known data

    The base of an isosceles triangle is 20 cm and the altitude is increasing at the rate of 1 cm/min. At what rate is the base angle increasing when the area is 100 cm^2?

    2. Relevant equations

    3. The attempt at a solution

    Im very unsure about my solution method. I have attached a copy my solution in pdf format, and would really appreciate if someone could take a quick look at it, and preferably tell me if its right or wrong..

    Thanks :smile:

    Attached Files:

  2. jcsd
  3. Jun 1, 2010 #2


    Staff: Mentor

    Looks good with one very minor exception tan-1(1) = pi/4 (exactly), and is only approximately equal to .7854.
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