Question

The radius of a hemisphere having a total surface area of 1848 sq. cm is ___

• A. 14 cm
• B. 7 cm
• C. 3.5 cm
• D. 21 cm

Answer 1

The correct option is A 14 cm

Total surface area of a Hemisphere $=3\pi r^2$

$\Rightarrow 3\times \frac{22}{7}\times r^2=1848$
$\Rightarrow r^2=\frac{1848\times 7}{22\times 3}$
$\Rightarrow r^2=28\times 7$
$\Rightarrow r=14cm$.