Find the surface area $$(in cm^2)$$ of a sphere of diameter 7 cm.
Radius of sphere, $$r=\frac{7}{2}$$ cm
=> Surface area = $$4\pi r^2$$
= $$4\times\frac{22}{7}\times(\frac{7}{2})^2$$
= $$22\times7=154$$ $$cm^2$$
=> Ans -Â (A)
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