Question

find the total surface area of the hollow cylinder open on the both sides of the length is 50 cm external diameter is 30 cm and the thickness is 4 cm​

Answer 1

Step-by-step explanation:

Given for the hollow cylinder with open at both ends, length is h=12 cm, external diameter is 8 cm and the thickness is 2 cm.

Then external radius is r

1

=4 cm and internal radius isr

2

=4−2=2 cm.

Now the total surface area of the hollow cylinder will be,

=2×π×(r

1

−r

2

)×h

=2×π×(4−2)×12

=48π cm

2

.