Question

find the total surface area of an open pipe lenght 50 cm,external diametre 20cm and internal diametre 6 cm

Answer 1

Hi @ChiefArnav, so where did you stuck when solving this task ?

Answer 2

you can add the external surface area of the pipe to the inside surface area walls of the pipe.
then treat the top and bottom by itself

Answer 3

?

Answer 4

can you show me the steps

Answer 5

may be i might uinderstand then

Answer 6

let R = big radius
r = little radius
h= height


Surface Area = 2*Pi *(R+r)*h + 2*Pi*(R^2-r^2)

Answer 7

the equation gives you
surface area = lateral areas + area of top/bottom

Answer 8

so what is big radius R here?

Answer 9

we know the big diameter is 20

Answer 10

@triciaal
Surface area of the side is given by: A = 2Pi*r*h

So, let the inner surface area be 2Pi*r*h and the outer surface area be 2Pi*R*h

The total area will be: 2Pi*r*h + 2Pi*R*h

you can factor

2Pi * ( R + r) h