Correct Answer: CSA – 308 cm ² ; TSA – 462 cm ²

Solution : The curved surface area (CSA) and the total surface area (TSA) of a hemisphere whose radius is 7 cm are:
Given,
radius($r$) = 7 cm
We know,
Curved surface area (CSA) = $2πr^2$
⇒ CSA = $2\times\frac{22}{7}\times7\times7$
⇒ CSA = 308 cm ²
Total surface area (TSA) = $3πr^2$
⇒ TSA = $3\times\frac{22}{7}\times7\times7$
⇒ CSA = 462 cm ²
Hence, the correct answer is CSA – 308 cm ² ; TSA – 462 cm ² .