Question

a closed cylindrical tank of radius 7m and height 3m is made from a sheet of metal,​

Answer 1

Area of Cylinder = 2πrh

= 2 × 22/7 × 7 × 3

= 132 m²

Area of Rectangle (from which Cylinder is made) = Length × Width

= l × 7 [Length = l]

or, l × 7 = 132 m²

l = 18.857 ≈ 18.86 m

Length of Metallic Sheet = 18.86 m

Answer 2

Answer:

hey.... 440m² is the answer