# A pizza restaurant wants to make a pizza that is 10% bigger than the current 8 inch pizza. What is the diameter of the new pizza?

asked Oct 22, 2015 in K-12

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 = $8(\sqrt{1.1}) = 8.3$

The new diameter is 8.3 inches.

answered Oct 28, 2015 by (6,320 points)
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