JAMB Mathematics 2018 Objective — Question 16

Question 16 of 39 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2018 Objective paper, with the correct answer and a full explanation.

Area of a sector of a circle with radius 10.5cm and angle 120°. Find the perimeter of the sector

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

Explanation

Arc length = (120/360)×2πr = (1/3)×2×(22/7)×10.5 = 22cm. Perimeter = arc+2r = 22+21 = 43cm.

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