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JAMB Mathematics 2015 Objective — Question 14

Question 14 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2015 Objective paper, with the correct answer and a full explanation.

If the angle of a sector of a circle with radius 10.5cm is 120°, find the perimeter of the sector.

A. 45cm
B. 48cm
C. 40cm
D. 43cmCorrect

Explanation

Perimeter = 2r + (θ/360)×2πr = 21 + (1/3)×2×(22/7)×10.5 = 21+22 = 43cm.

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