WAEC Mathematics 2014 Objective — Question 39
Question 39 of 50 from the West African Examinations Council (WAEC) Mathematics 2014 Objective paper, with the correct answer and a full explanation.
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A chord subtends an angle of 120° at the centre of a circle of radius 3.5cm. Find the perimeter of the minor sector containing the chord. [Take π=22/7]
- A. 14⅓cmCorrect
- B. 12⅚cm
- C. 8⅓cm
- D. 7⅓cm
Explanation
Perimeter = arc length + 2r = (120/360)×2×(22/7)×3.5 + 2(3.5) = 7.333+7 = 14⅓cm.
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