The diameter of a hemisphere is 21 cm. What is the total surface area of the hemisphere?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 1039.5 cm2.
Diameter = 21 cm
Radius = 21/2 = 10.5 cm
Now,
Total surface area(TSA) = 3πr2
here, r = radius
TSA = 3 × 22/7 × 10.5 × 10.5
⇒ 7276.5/7 = 1039.5 cm2