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A chord of a circle of a diameter 42cm subtends an angle of 60o at...

Mathematics
JAMB 1997

A chord of a circle of a diameter 42cm subtends an angle of 60o at the centre of the circle. Find the length of the mirror arc

  • A. 22cm
  • B. 44cm
  • C. 110cm
  • D. 220cm
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Correct Answer: Option A
Explanation

Diameter = 42cm

Length of the arc = \(\frac{\theta}{360°} \times \pi d\)

= \(\frac{60}{360} \times \frac{22}{7} \times 42cm\)

= \(22cm\)


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