WBCS.LIVE practice question

An arc of length 121 cm makes an angle 77Ā° at the centre of a circle. The radius of the circle is

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 110 cm
  2. 100 cm
  3. 90 cm
  4. 70 cm

Correct answer and explanation

Correct answer: 90 cm

Explanation: āœ… Correct Answer: C) 90 cm šŸ“š Explanation: Using the formula L = θ360×2πr, we have 121 = 77360×2×227×r Simplifying this gives, r = 90 cm