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A square concrete foundation is a base for a cylindrical tank (see figure). (a) Write the radius

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A square concrete foundation is a base for a cylindrical tank (see figure).
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(a) Write the radius r of the tank as a function of the length x of the sides of the square.
(b) Write the area A of the circular base of the tank as a function of the radius r.
(c) Find and interpret (A ˆ˜ r)(x).

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