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Math Help - solving equation

  1. #1
    wjt
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    solving equation

    Hi, I am a very elderly person, I have long forgotten my mathematics but i now find the need to solve a simple equation:
    In any right angle triangle having sides a,b,c and angles A,B,C, I want to solve for "c".
    in my example, a=3. I think c = a cos A but no matter how many times I enter this data , I can not get the answer which is c = 5.
    Please lead me through the actual steps to solve this using an engineering calculator.
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by wjt View Post
    Hi, I am a very elderly person, I have long forgotten my mathematics but i now find the need to solve a simple equation:
    In any right angle triangle having sides a,b,c and angles A,B,C, I want to solve for "c".
    in my example, a=3. I think c = a cos A but no matter how many times I enter this data , I can not get the answer which is c = 5.
    Please lead me through the actual steps to solve this using an engineering calculator.
    What side is the hypotenuese (longest side - opposite the right angle) in your triangle?

    Chances are it will be some form of the Pythagorean Theorem:

    <br />
c^2 = a^2+b^2
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