What is the diameter (in cm) of a sphere of surface area 154 sq cm?
Surface area of sphere = 154
$$4\pi r^{2} = 154$$
$$4\times \frac{22}{7}r^{2} = 154$$
$$r^{2} = 12.25$$
$$r = 3.5$$
$$diameter = 2r = 7$$
So the answer is option D.
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