Question

The total surface area of a solid hemisphere of diameter $2$ cm is equal to

• A. $12{cm}^2$
• B. $12\pi {cm}^2$
• C. $4\pi {cm}^2$
• D. $3\pi {cm}^2$

Answer 1

The correct option is D $3\pi {cm}^2$

Total surface area of hemisphere $=2\pi r^2+\pi r^2$

Given, diameter $=2$ cm

Therefore, radius $=1$ cm.

Therefore, total surface area is $3\pi r^2$

$=3\times \pi \times (1{)}^2$

$=3\pi$ sq.cm.