Question

How many area of metal sheet is required to make an open cylindrical tank of radius 3.5 and height of 12 m ?

Answer 1

height=12

radius=3.5

Metal sheet required to make open tank= 2πrh+πr×r

                                                   2×22/7×3.5×12+22/7×3.5×3.5

                                                  =264+38.5

                                                  =302.5 m²