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Area, SM-Bank 151

The circle pictured below has an area of \(144\pi \) square centimetres.
 

Calculate the radius of the circle.  (2 marks)

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\(12\ \text{cm}\)

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\(A\) \(=\pi r^{2} \)
\(144 \pi\) \(= \pi r^2\)
\(r^{2}\) \(=144\)
\(r\) \(=\sqrt{144}\)
  \(=12\ \text{cm}\)