Q

# A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How much sheet of metal is required?

A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How much sheet of metal is required?

$= 2\Pi \times7(7+3) = 14\Pi \times10 = 440\ m^2$