You can work out the area of a circle by squaring the radius (multiplying the radius by itself) and multiplying this by pi.
In this case the radius is 22cm so multiply 22 by 22. This equals 484.
Multiply 484 by pi (3.14).
This makes the answer 1520.53 cm2.
Make sure that this is the radius and not the diameter. The radius is only from the centre of the Pizza to one side, not all the way across, because that sounds like a massive pizza.
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radius = 22/(2*pi) = 3.501408748 Surface area = 4*pi*3.5014087482 = 154.0619849 square cm
24 inches, because the radius is always 1/2 of the diameter.
Area of a circle = pi x radius squared, so to get the radius, divide the Area by pi (3.14159), and then find the square root of that
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