### Home > PC3 > Chapter 11 > Lesson 11.2.4 > Problem11-130

11-130.

If someone in your class has been away and just came back today, write a clear description of how they can plot the graph of $r = 3\cos(2θ)$. Once you have written your instructions, sketch the graph.

A table can always be made to help with sketching a curve.
In this case, $θ$ is the independent variable.