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

question 22

Multiple Choice

Solve the problem.
-The area $\mathrm { A } = \pi \mathrm { r } ^ { 2 }$ of a circular oil spill changes with the radius. To the nearest tenth of a square foot, how much does the area increase when the radius changes from $7 \mathrm { ft }$ to $7.1 \mathrm { ft }$ ?

• A) \(4.4 \mathrm { ft } ^ { 2 }\)
• B) \(2.8 \mathrm { ft } ^ { 2 }\)
• C) \(44.0 \mathrm { ft } ^ { 2 }\)
• D) \(22.0 \mathrm { ft } ^ { 2 }\)

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