The curved surface area (CSA) and the total surface area (TSA) of a hemisphere whose radius is 7 cm are:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. CSA – 308 cm2 ; TSA – 462 cm2.
Given that
The radius of a hemisphere (r) = 7 cm
Formula used
The total surface area (TSA) of a hemisphere = 3πr2 square units.
The curved surface area (CSA) of a hemisphere = 2πr2 square units.
Calculation
TSA = 3 × (22/7) × 49 = 462 cm2
CSA = 2 × (22/7) × 49 = 308 cm2