Express the area A of a circle as a function of its radius, r. Determine the area of a circle whose radius is 4 inches. That is, find A(4).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.5: Graphs Of Functions
Problem 34E
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Express the area A of a circle as a function of its radius, r. Determine the area of a circle whose radius is 4 inches. That is, find A(4). 

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