The area of a circle is a function of its radius, and is given by  A(r) = πr2. (a)  Find the area of a circle whose radius is 4 inches. Round to the nearest tenth of a square inch.  in2

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Chapter3: Functions
Section3.4: Composition Of Functions
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The area of a circle is a function of its radius, and is given by 

A(r) = πr2.
(a)  Find the area of a circle whose radius is 4 inches. Round to the nearest tenth of a square inch.
 in2

(b)  Find the area of a circle whose radius is 13 centimeters. Round to the nearest tenth of a square centimeter.
 cm2
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