Question

The curved surface area of a cylinder is 1320 cm square and its base has diameter 21 cm. Find the volume of the cylinder.

Answer 1

GIVEN –

diameter = 21 cm
so, radius = 21/2cm

The curved surface area of a cylinder = 1320cm^2

2πrh = 1320
2 × 22/7 × 21/2 × h = 1320
h = 1320 × 1/2 × 7/22 × 2/21
h = 20 cm

NOW,

the volume of the cylinder = πr^2h
v = 22/7 × 21/2 × 21/2 × 20
v = 6930 cm^3

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Answer 2

height = 20 cm and volume is 6930 cm^3

Step-by-step explanation:

Given :-

Diameter = 21 cm

radius = 21/2

height = ?

curved surface area :- = 1320

2πrh = 1320

2x 22/7 x 21/2 xH

h= 1320 /60

= 20 cm

so the height of the cylinder is 20 cm

Now,

for finding value of volume is as follows

the volume of the cylinder is πr^2h

=22/7 x 21/2 x21/2 x20

= 6930 cm ^3

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