Find the total surface area (in $$cm^{2}$$ ) of a hemisphere of diameter 42 cm.
Radius of hemisphere, $$r=\frac{42}{2}=21$$ cm
Total surface area = $$3\pi r^2$$
= $$3\times\frac{22}{7}\times (21)^2$$
= $$66\times3\times21=4158$$ $$cm^2$$
=> Ans - (A)
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