For this question, you need to find the area of the rectangular pan of pizza first. As you know, you find the area of a rectangle by multiplying the two sides by one another. In this case, that is 12*16 = 192.

Then you have to figure the area of a circle. The equation for that is area = pi*r^2 where r is the radius of the circle.

So we know the area and we know pi so our equation is

192 = 3.14(r^2).

We divide both sides by 3.14 and we get

61.14 = r^2

Take the square root of 61.14, which is 7.8.

So the circular pan needs to be 7.8 inches in radius or 15.6 inches in diameter.

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