Question

If the width of a hollow cylinder is 2 cm. Its internal diameter is 14 cm and height 26 cm. The two ends of cylinder are opened. Find the total surface area of the hollow cylinder.

Answer 1

Given internal diameter of hollow cylinder =14 cm.

∴ Internal radius (r₂) = 7 cm

Width of the cylinder = 2 cm

∴ External radius (r₁) = 7 + 2 = 9 cm

Height (h) 26 cm.

Total surface area of cylinder

Hence, the total surface area of cylinder = 2816 cm²