The first step in making this happen will be to make a template. Start by printing out a few sheets of polar graph paper; I used the generator at http://incompetech.com/graphpaper/polar/
with 10 primary spokes and 14 concentric circles.
Cut an 8.5" circle from the center of the pizza pan. I used a circle cutter to "score" the rim of the circle, then a hobby knife to finish off any spots that weren't cut all the way through. Also cut the circle out of the graph paper; it should be about 8".
Tape the two circles together concentrically. I found it easier to cut the sections out of the template if I shaded in the parts to be cut first. Start by shading in the entire center two circles. Skip the next circle, then fill in three segments of the fourth circle, representing the 3 at the beginning of π. Skip the fifth circle, then fill in 1 segment, representing the 1 after the decimal. Continue in that fashion, skipping one circle between successive digits, until you hit the end of your graph paper. In my case, this was after the 9.