Question

a metal pipe is 77 cm long the inner diameter of a cross section is 4 cm the outer diameter being 4.4 cm find its
question 1 inner curved surface area
queation 2 outer curved surface area
question 3 total surface area

Answer 1

Height = 77 cm

Inner Readius = 2cm

Outer Radius = 2.4 cm

Inner Curved Surface Area = 2*22/7*2*77 = 968 cm2

Outer Curved Surface Area = 2*22/7*2.4*77 = 1161.6 cm2

TSA Of Hollow Cylinder = 2*pie*r*h + 2*pie*R*h+ pie*(R2-r2)

Or Outer Curved  Surface  Area+ Inner  Curved  Surface  Area+ Area  Of  Bases

=> 968 + 1161.6 + 22/7*(2.42-22)

=> 2129.6+22/7*1.76

=> 2129.6+5.53142

=>2135.13 cm2