Question

If the height of a cylinder is 21 cm and its volume and curved surface area is equal, what will be its total surface area?​

Answer 1

Answer:

A

c

=2πrh

A

c

=2×

7

22

×7×21

A

c

=22×42

A

c

=924 cm

We know that the volume of the cylinder

V=πr 2h

V= 7

22×7 2×21

V=22×21 times

V=3234 cm

Answer 2

Answer:

3

Step-by-step explanation:

We have,

h=21 cm

πr

2

=154

r=7 cm

We know that the curved surface area of the cylinder

A

c

=2πrh

A

c

=2×

7

22

×7×21

A

c

=22×42

A

c

=924 cm

2

We know that the volume of the cylinder

V=πr

2

h

V=

7

22

×7

2

×21

V=22×21 times

V=3234 cm

3

Hence, this is the answer.