The diameter of a hemisphere is 21 cm. What is the total surface area of the hemisphere?

Correct option is D

Given:
The diameter of the hemisphere is 21 cm, so the radius (r) = 21/2 = 10.5 cm.
Formula Used:
Total surface area of a hemisphere = 3 * π * r^2
Solution:
Total surface area = 3 * π * (10.5)^2 = 1039.5 cm².