Question

A metal pipe is 77 cm long.,the inner diameter of the cross section is 4 cm and outer diameter is 4.8cm.find inner curved surface area,outer curved surface area and total surface area

Answer 1

hope this will help you

Answer 2

inner r=2cm

Outer r=2.4cm

H=77cm

CSA:2πrh

Ques1:Inner curved surface

=2*22/7*2*77

=968cm

Ques2:Outer curved surface

=2*22/7*2.4*77

=1161.6cm

Ques3:Total surface area

=ICS+OCS+2(Area of the base of the ring)

=area of Both end =2(πR^2-πr^2)

=(2*22/7*2.4*2.4-22/7*2*2)

=11.05

968+1161.6+11.05=2140.66=answer

Hope this will help you!