[tex]\Huge{\boxed{\sf{\red{22.98m}}}}[/tex]
According to the question,
Slant height, l = [tex]\displaystyle{\sf{ \sqrt{{r}^2 + {h}^2} = \sqrt{{3.5}^2 + {8.5}^2}}}[/tex]
[tex]\implies[/tex] [tex]\displaystyle{\sf{ = 9.192m}}[/tex]
curved surface area = [tex]\displaystyle{\sf{ \pi rl}}[/tex]
[tex]\implies[/tex] [tex]\displaystyle{\sf{ \frac{22}{7} \times 3.5 \times 9.192{m}^2}}[/tex]
[tex]\implies[/tex] [tex]\displaystyle{\sf{ 101.112}}[/tex]
i.e., Area of the cloth is 101.11m²
Now, length of the cloth required = [tex]\displaystyle{\sf{ \frac{area}{width}}}[/tex]
[tex]\implies[/tex] [tex]\displaystyle{\sf{ \frac{101.11}{4.4}}}[/tex]
[tex]\implies[/tex] [tex]\large{\boxed{\sf{\red{22.98m}}}}[/tex]