Find the ratio of the total surface area to curved surface area of a cylinder whose radius is 20 cm and height 50 cm.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 7 : 5.
T.S.A of cylinder = 2πr (h + r)
C.S.A of cylinder = 2πrh
where, h = height and r = radius
Ratio = T.S.A/C.S.A = 2πr(h + r)/2πrh
⇒ (h + r)/h = (50 + 20)/50 = 70/50 = 7 : 5