# What is the graph of #r=a cos 4theta#?

##### 1 Answer

Plotting the polar curve for

I used Excel:

In the first column I put the angles in Radians;

In the second column is calculated

The next two columns contain the corresponding values of x and y to plot your equation on a rectangular coordinate system x,y.

To obtain the values in the x and y columns you must remember the relationship between polar (first two columns) and rectangular (second two columns) coordinates: