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Area of a circular pizza = 1/2 * pi * r^2 = 1/4 * pi * d^2
Where diameter is d, and radius is r.
We have:
1/4 * pi * d^2 = 1.1 * 1/4 * pi * (8^2)
Solve for d, and get
d =
The new diameter is 8.3 inches.