Second Pizza Theorem

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Q: What is the volume of a pizza whose radius is $z$ and whose thickness is $a$?
A: From Volume of Cylinder: $\text {pi} z z a$.

Also see

Historical Note

The Second Pizza Theorem has been around for many years, and it is not possible to identify its origin.

It appeared in print as long ago as $2002$, on page $2251$ of the CRC Concise Encyclopedia of Mathematics.

It has probably had multiple originators who discover it independently.