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Find the radius of a circle in which an arc of length 44cm subtends angle...

Mathematics
WAEC 1997

Find the radius of a circle in which an arc of length 44cm subtends angle 200° at the centre of the circle. [Take π = 22/7]

  • A. 3.9cm
  • B. 12.6cm
  • C. 25.2cm
  • D. 38.4cm
  • E. 124.5cm
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Correct Answer: Option B
Explanation

44 = 200/360 x 2 x 22/7 x r

r = 360 x 7 x 44/200 x 2 x 22

= 12.6cm

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