Inner radius (r1)of cylindrical pipe = (4/2)cm = 2cm
Outer radius (r2) of cylindrical pipe = (4.4/2)cm = 2.2cm
Height (h) of cylindrical pipe = Length of cylindrical pipe = 77 cm
(i) CSA of inner surface of pipe = 2πr1h
= ( 2 x 22/7 x 2 x 77 )cm = 968cm2
(ii) CSA of outer surface of pipe 2πr2h
= ( 2 x 22/7 x 2.2 x77 )cm2
= ( 22 x 22 x 22 )cm2
= 1064.8cm2
(iii) Total surface area of pipe = CSA of inner surface + CSA of outer surface + Area of both circular ends of pipe
Therefore, the total surface area of the cylindrical pipe is 2038.08 cm2.