The length is given 77 cm and inner diameter is 4 cm and outer diameter is 4.4 cm.
To determine the inner curved surface area
Use the inner diameter that is 4cm.
And use the formula
[tex]ISA=2\pi rh[/tex][tex]\text{isa}=2\pi\times2\times77=3388sq.\operatorname{cm}[/tex]To determine the outer curved surface area , use the outer diameter .
[tex]sa=2\pi Rh=2\pi\times2.2\times77=3726.8sq.cm[/tex]