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First, find the area of the round pizza:
The area of a single slice would be 1/12 of the whole area:
Aslice = 49*Pi/12 = 12.83 inches squared
Now find the area of the square pizza:
We are cutting it into 9 pieces, so to find the area of one piece:
Aslice = 144/9
Aslice = 16 inches squared
So the square slice is larger, by (16-12.83) 3.17 square inches.