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Circles, SM-Bank 043

Use the arc length formula below to calculate the arc length of the sector, correct to two decimal places.  (2 marks)

\(l=\dfrac{\theta}{360}\times 2\pi r\)

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\(7.54\ \text{m  (2 d.p.)}\)

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\(l\) \(=\dfrac{\theta}{360}\times 2\pi r\)
  \(=\dfrac{90}{360}\times 2\pi \times 4.8\)
  \(=7.5398\dots\)
  \(=7.54\ \text{m  (2 d.p.)}\)