WAEC Mathematics 2022 Objective — Question 21

Question 21 of 50 from the West African Examinations Council (WAEC) Mathematics 2022 Objective paper, with the correct answer and a full explanation.

In the diagram, ∠POQ=150° and the radius of the circle PSQR is 4.2cm. [Take π=22/7]. Find the length of the minor arc PRQ.

• A. 11.00 cmCorrect
• B. 15.40 cm
• C. 17.64 cm
• D. 23.10 cm

Explanation

Length of minor arc = (θ/360)×2πr = (150/360)×2×(22/7)×4.2 = 11.00 cm.

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