Question

The ratio of the total surface area to the lateral surface area of a cylinder whose radius is
20 cm and height 60 cm, is
(a) 2:1
(b) 3:2
(c) 4:3
(d) 5:3​

Answer 1

Answer:

Correct option is C

4:3

Let the total surface area and lateral surface area are S1 and S2 respectively.

S1=2πr2+2πrh

and S2=2πrh

Thus, S2S1=2πrh2πr(r+h)=hr+h=6020+60=6080=34

Answer 2

Answer:

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