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JAMB Mathematics 2007 Objective — Question 28

Question 28 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2007 Objective paper, with the correct answer and a full explanation.

Calculate the length of an arc of a circle of diameter 14cm, which subtends an angle of 90 degrees at the centre of the circle.

A. 7pi/4 cm
B. 7pi/2 cmCorrect
C. 7pi cm
D. 14pi cm

Explanation

Radius=7cm. Arc length = (90/360) x 2 x pi x 7 = 7pi/2 cm.

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