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Homework Help: Polar to Cartesian

  1. Mar 18, 2008 #1
    1. The problem statement, all variables and given/known data

    Replace the polar equation by an equivalent Cartesian (rectangular) equation. Then identify or describe the graph.

    ****Let's just make x = theta because I can't find a theta symbol*****

    r = 2cos(x) + 2sin(x)

    2. Relevant equations


    3. The attempt at a solution

    x = rcos(x) = (2cos(x) + 2sin(x)) * cos(x)
    y = rsin(x) = (2cos(x) + 2sin(x)) *sin(x)

    No idea what do to from here.

    Thanks in advance
  2. jcsd
  3. Mar 18, 2008 #2


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    Homework Helper

    Try multiplying [itex]r = 2\cos\theta + 2\sin\theta[/itex] through by [itex]r[/itex].
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