Question

Volume of a hemisphere is $19404$ cubic cm. The total surface area is _________.

• A. $2772$ sq.cm
• B. $4158$ sq.cm
• C. $5544$ sq.cm
• D. $1386$ sq.cm

Answer 1

Answer: (B)

$4158$ sq.cm

Volume of hemisphere is given as $\frac{2}{3}\pi r^3=19404c.c.$

$\Rightarrow r=21$ cm

Surface area of hemisphere $=3\pi r^2=3\times \pi \times {21}^2$

$=3\times 441\times 3.14$

$=4158{\text{cm}}^2$