The height of a solid cylinder is 4 times its radius. Its curved surface area is ______
times its base area.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 8.
Given, h = 4r
here, h = height, and r = radius
Curved surface area(CSA) = 2πrh = 2πr × 4r = 8πr2
Base area = πr2
Ratio = 8πr2/πr2 = 8
So, CSA is 8 times the base area