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Calculate the perimeter of a sector of a circle of raduis 9cm and angle 36o.

Mathematics
JAMB 2016
Calculate the perimeter of a sector of a circle of raduis 9cm and angle 36o.
  • A. 18cm
  • B. (18 + \(\frac{9\pi}{5}\))cm
  • C. (9 + \(\frac{9\pi}{5}\))cm
  • D. \(\frac{9\pi}{5}\)cm
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Correct Answer: Option B
Explanation
Perimeter = 2r + \(\frac{\theta}{360}\) x 2\(\pi\)r
2(9) + \(\frac{36}{360}\) x 2 x \(\pi\) x 9 = 18 + \(\frac{9\pi}{5}\)

There is an explanation video available below.

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Explanation Video

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