What is the curved surface area of a hemisphere whose radius is 7 cm? (take π= 22/7)

Correct option is B

The formula for the curved surface area of a hemisphere is $$2 \pi r^2$$​, where r is the radius of the hemisphere. Substituting r = 7 cm and $$π = \frac{22}{7}$$​:
Curved Surface Area = 2 \times$$\left(\frac{22}{7}\right) \times (7^2).$$​
First, compute $$7^2 = 49.$$​
So,
$$2 \times \frac{22}{7} \times 49 = 2 \times 22 \times 7 = 44 \times 7 = 308 \, \text{cm}^2.$$​