Question

Form a sheet of 8 square meter, a closed cylindrical tank is formed which has one meter height and 140 cm diameter.How much sheet will be left after making tank?

Answer 1

For cylindrical tank diameter = 140 cm.

∴Radius (R) = 140/2 cm. = 70 cm.

Height (H) = 1 meter = 100 cm.

∴ Surface area of cylindrical tank = 2 πR (H + R)

= 2 . 22/7 . 70 (100 + 70)

= 74800 cm²

= 74800/1000 m²

= 7.48 m²

Surface area of metal sheet = 8 m²

∴ Surface area of remaining sheet = 8 – 7.48

= 0.52 m²