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

question 538

Multiple Choice

Solve the problem.
- $\mathrm { A } = \pi \mathrm { r } ^ { 2 }$ , where $\mathrm { r }$ is the radius, in centimeters. By approximately how much does the area of a circle decrease when the radius is decreased from $4.0 \mathrm {~cm}$ to $3.9 \mathrm {~cm}$ ? (Use $3.14$ for $\pi$ .)

• A) \(1.3 \mathrm {~cm} ^ { 2 }\)
• B) \(2.3 \mathrm {~cm} ^ { 2 }\)
• C) \(2.5 \mathrm {~cm} ^ { 2 }\)
• D) \(2.7 \mathrm {~cm} ^ { 2 }\)

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