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-- The circumference of any circle is (pi) x (diameter) = 9 pi = 28.274 inches.

-- The radius of a circle is 1/2 of its diameter. The radius of the dinner plate is 4.5 inches.

-- The area of a circle is (pi) x (radius)2. The area of the dinner plate is probably

a bit more than that, because it's not a flat surface.

-- The area of the flat circle in the plane defined by the rim of the plate is

(pi) x (4.5)2 = 20.25 pi = 63.617 square inches(rounded)

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Q: Derek's dinner plate has a diameter of about 9 inches find its circumferences and area?
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