The diameter of a hemisphere is 6 cm. The ratio of the magnitudes of its curved surface area to the total surface area is:
Show answer & explanation
Correct answer: D
Explanation
The Correct answer is option 4 i.e. 2:3
Given that
The diameter of a hemisphere is 6 cm
The radius of the hemisphere is R = 6/2 = 3 cm
Formula used
The curved surface area = 2πr2
The total surface area of hemisphere is 3πr2
According to the question
⇒ the curved surface area/the total surface area = 2πr2/ 3πr2
⇒ 2/3
Hence, the required ratio = 2 : 3