In the circle above, with centre O and radius 7 cm. Find the length of the arc AB, when < AOB = 57°.

  • A 5.32 cm
  • B 4.39 cm
  • C 7.33 cm
  • D 6.97 cm
jamb 2019mathematics

The correct answer is D. 6.97 cm

Length of arc = \(\frac{\theta}{360°} \times 2 \pi r\)

= \(\frac{57}{360} \times 2 \times \frac{22}{7} \times 7\)

= 6.97 cm

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