Question

23. 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
The number of coins, each of radius 0.75 cm and thickness 0.2 cm, to be melted to make a
24​

Answer 1

Let the total surface area and lateral surface area are S

1

and S

2

respectively.

S

1

=2πr

2

+2πrh

and S

2

=2πrh

Thus,

S

2

S

1

=

2πrh

2πr(r+h)

=

h

r+h

=

60

20+60

=

60

80

=

3

4

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Answer 2

Answer:

Answer is 4: 3 option C

Step-by-step explanation:

DIVIDE THE T.S.A BY L.S.A

SEE THE PROCESS ABOVE ITS THERE