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Area, SM-Bank 107

Calculate the area of the following circle, correct to one decimal place.  (2 marks)
 

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\(422.7\ \text{cm}^2\ (1\ \text{d.p.})\)

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\(\text{Diameter}=23.2\ \text{cm}\)

\(\therefore\ \text{Radius}=11.6\ \text{cm}\)

\(\text{Area}\) \(=\pi r^2\)
  \(=\pi\times 11.6^2\)
  \(=422.7327\dots\)
  \(\approx 422.7\ \text{cm}^2\ (1\ \text{d.p.})\)