Question

a metal pipe is 77 cm long .the inner diameter of a cross section is 4 cm the outer diameter beIN 4.8cm find it's
inner curved surface area of cylinder
outer curved surface area of cylinder
total surface area of cylinder

Answer 1

heya!!

it's too easy☺

Diameter of inner cylinder =4

radius =4/2=2
h=77cm
Now,curved surface area of cylinder
=)2πrh

=)2*22/7*2*77.

=). 968Ans....

and ,outer radius =4.8/2=2.4

curved surface area of outer cylinder

=)2πRh

=)2*22/7*2.4*77

=)1161.6 Ans

again total surface area of cylinder .
=)2πR2h+πR^2h

=)1161.6+18.0864

=)1179.6864Ans

hope it help you☺

@rajukumar☺