Question

Find the total surface area of a hemisphere of radius $10$ cm. (Use $\pi =3.14$)

• A. $942{cm}^2$
• B. $492c{m}^2$
• C. $249c{m}^2$
• D. $924c{m}^2$

Answer 1

The correct option is A $942{cm}^2$

Given, radius $r=10$ cm

Total surface area of a hemisphere of radius '$r$' $=3\pi r^2$
Hence, total surface area of this hemisphere $=3\times 3.14\times 10\times 10$

$=942$ sq.cm