JAMB Mathematics 2009 Objective — Question 29

Question 29 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2009 Objective paper, with the correct answer and a full explanation.

Find the radius of a sphere whose surface area is 154 cm^2

A. 7.00 cm
B. 3.50 cmCorrect
C. 3.00 cm
D. 1.75 cm

Explanation

Surface area = 4 pi r^2. 154 = 4 x (22/7) x r^2. r^2 = (154x7)/(4x22) = 12.25. r = sqrt12.25 = 3.5 cm.

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