Question

A closed cylindrical tank of height 1.4m. and radius of the base is 56 cm. is made up of a thick metal sheet. How much metal sheet is required (Express in square meters)

Answer 1

Given dimensions of closed cylindrical tank are
Height =h=1.4m
Radius =r=56cm=56/100 m =0.56m
Metal sheet required to make cylindrical tank= total surface area of the cylindrical tank
=2×pi×r(r+h)
=2×22/7×0.56(0.56+1.4)
=2×22×0.08×1.96
=6.8992 square meters

Answer 2

Hi,
Thanks for your question!

The dimensions given for the closed  cylindrical tank are 

Height = h =1.4 m
Radius  = 56 cm = 0.56 m

So the Metal sheet required to make cylindrical tank are  = total surface area of cylindrical tank which is equal to 2$\pi$r(r+h)

=2×22/7×0.56(0.56+1.4)
=2×22×0.08×1.96
=6.8992 square meters

Hope it helps!