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The formula for the area of a circle is A = pi x r2.

That means that the circle's area is calculated by multiplying the value of "pi" (3.1416) times the radius of the circle (r) multiplied by itself.

A circle's radius is, by definition, half its diameter. So since the formula wants the radius, find that first by dividing the known diameter by 2. (In this case, then, the radius will be half of 12 inches, or 6 inches.)

Now work the problem:

A = pi x r2

A = 3.1416 x 6 in. x 6 in.

A = 3.1416 x 36 in2

A = 113.0976 in2

That's an area of about 113.1 square inches.

Be sure to keep track of the units when working these problems!

Edit: Of course, since a Pizza exists in 3 dimensions, you would multiply the circle area by the depth of the pizza.

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Q: If a pizza has a diameter of 12 inches how do you use a formula to find the area of the pizza?
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