Question

The diameter of a cylindrical tin is $80$ $cm$ and height is $1.5$ $m$. How many square metre will be its curved surface area? $(\pi =3.14)$

Answer 1

curved surface area$=2\times \pi \times r\times h$

$=2\times 3.14\times 0.8\times 1.5$

$=7.536$ metre square