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Homework Help: Find the Cartesian equation for .

  1. Jan 27, 2015 #1
    1. The problem statement, all variables and given/known data
    r = 4sec(θ)

    2. Relevant equations
    x2 + y2 = r2
    y = rsin(θ)
    x = rcos(θ)

    3. The attempt at a solution
    Given that r = 4sec(θ), I replaced sec(θ) with 1/cos(θ) and got x = 4. The problem is that I'm not sure if that's the final answer because I have been unable to find r, y or θ.
  2. jcsd
  3. Jan 27, 2015 #2


    Staff: Mentor

    Is that the whole problem statement? We can't help if we don't see the complete statement.

    Did they expect you plot it or convert it to xy coordinates?

    If it's a conversion to xy then whatif you place the secant on the other with the r?
  4. Jan 27, 2015 #3


    User Avatar
    Science Advisor
    Homework Helper

    The cartesian form of r = 4sec(θ) IS x=4. It's a vertical line y can be anything. Why do you think you should be able to find r, y or θ?
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