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Mathematics 13 Online
OpenStudy (anonymous):

An aluminum plate is made according to the following dimensions. The outer radius is 10 inches and the inner radius is 3 inches. Use p = 3.14 as an approximate value. (a) How many square inches in area is the aluminum plate (the shaded region)? (b) If the cost to construct the plate is $7.50 per square inch, what is the construction cost?

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