Thread: Sketch polar

how do i sketch this polar equation r = 1 - 2 cos theta

Hello, reiward!

How do i sketch this polar equation? .

You should be familiar with the curve called the limacon.
. . This one has a "loop".


Calculate a few ponts:

. .


The graph looks like this:

Code:

                  :
              * * o 1
          *       : *
        *         :   *
       *          :   *
                  :  *
      *      * *  : *
  - - o - - o - - * - - - -
    3 *   -1 * *  : *
                  :  *
       *          :   *
        *         :   *
          *       : *
              * * o 1
                  :