Solve the Problem $A = \pi r ^ { 2 }$

question 505

Multiple Choice

Solve the problem.
-The area $A = \pi r ^ { 2 }$ of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when $r = 4 \mathrm { ft }$ ?

• A) \(8 \pi \mathrm { ft } ^ { 2 } / \mathrm { ft }\)
• B) \(4 \pi \mathrm { ft } ^ { 2 } / \mathrm { ft }\)
• C) \(8 \mathrm { ft } ^ { 2 } / \mathrm { ft }\)
• D) \(16 \pi \mathrm { ft } ^ { 2 } / \mathrm { ft }\)

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