Question 2 (i)
Find the surface area of a sphere of diameter:

(i) 14cm $[A s s u m e π = \frac{22}{7}]$

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Solution

Radius (r) of the sphere $= \frac{D i a m e t e r}{2} = (\frac{14}{2}) c m = 7 c m$
Surface area of sphere $= 4 π r^{2}$
$= (4 \times \frac{22}{7} \times (7)^{2}) c m^{2} = 616 c m^{2}$

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