Mathematicians had previously come up with a recipe for slicing that gives people 12 identically shaped pieces, six of which form a star extending out from the center, while the other six divide up the crusty remainder. They start by cutting curved three-sided slices into the pizza, then divide these slices in two to get the inside and outside groups. Now Joel Haddley and Stephen Worsley of the University of Liverpool, UK, have generalized the technique. The pair have proved people can create similar things from curved pieces with any odd number of sides that are then divided in two as before
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