Click/hover on a piece of the pie
Check out the source code: pie.php
You want to see a pie with 360 slices?

Radius:

Buffer: This is the buffer zone around the pie graph

Offset: The percentage clockwise from the default pie starting point, which is along the x-axis (3 0'clock) FYI: .75 is 75%

Number of tics: Too many tics can cause the colors to fill incorrectly

Tic length: Too long of a tic length can also cause problems

Slice widths: 2,2,2,1,1
                               Put in the slice widths separated by a comma
                               For example, if you want a pie with 2 parts red and 2 parts white and 2 parts blue and 1 part yellow and 1 part purple
                               you would use 2,2,2,1,1     And 5,9,7,6,2 for the colors

Slice colors: 5,9,7,6,2
                               Separate the colors by a comma. Use one color number per each slice value

Color Codes:
0: gray
1: bluish
2: purple
3: black
4: light blue/purple
5: red
6: yellow
7: blue
8: navy
9: white

You want to see a pie with 360 slices?
Go here: 360 slice pie