Sorry to break your heart, but no. Pi is just a number approximately 3.14 and a pie is a yummy pastry.
However, if the pie is round, then the ratio between the circumference and the diameter is pi. If you measure from the edge to the center of the pie, you get its radius, and if you square that and multiply by pi, you get the surface area of the pie. Then you can multiply by the height to get the volume if the pan is cylindrical. If it is a partial cone, that would take a different formula.
Interesting fact: 3.14 in a mirror is PI.E