The radii of the ends of a bucket 16 cm high are 20 cm and 8 cm. The curved surface area of the bucket is `1760\ c m^2` (b) `2240\ c m^2` (c) `880\ c m^2` (d) `3120\ c m^2`

Explanation

Bucket top radius ` r_{1}=20 cm`


Bucket bottom radius `r_{2}=8 cm`


Bucket height `=16 cm`


The C.S.A.` =pi(r_{1}+r_{2}) l`

`
l=sqrt{h^{2}+(r_{1}+r_{2})^{2}}`

`
=sqrt{16^{2}+(20-8)^{2}}`

`
=sqrt{256+144}`

`
l=sqrt{400}`

`
...