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The Pizza Theorem

http://commons.wikimedia.org/wiki/File:Pizza_theorem_1.svg

If you’re sharing a pizza with another person, there’s no need to cut it into precisely equal slices.

Make four cuts at equal angles through an arbitrary point and take alternate slices. You’ll both get the same amount of pizza.

Also: If a pizza has thickness a and radius z, then its volume is pi z z a.