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find the radius of a sphere whose surface area ... - JAMB Mathematics 1993 Question

find the radius of a sphere whose surface area is 154cm2 (\(\pi = \frac{22}{7}\))
A
7.00cm
B
3.50cm
C
3.00cm
D
1.75cm
correct option: b

Surface area = 154cm2 (area of sphere)

4(\pi)r2 = 154

r(\sqrt{\frac{154}{4\pi}})

= 3.50cm

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