A cylindrical tube open at both ends is 20 cm long. Its outer radius is 9 cm and its inner radius is 5 cm. Find its total surface area in cm² (outer curved surface + inner curved surface + the two ring-shaped rims). Take π = 22/7.

Question

Accepted Answer

2112. Outer curved surface = 2π × 9 × 20 = 360π. Inner curved surface = 2π × 5 × 20 = 200π. The two rims are rings of area π(81 − 25) each, together 2 × 56π = 112π. Total = 672π = 672 × 22/7 = 2112 cm².

A cylindrical tube open at both ends is 20 cm long. Its outer radius is 9 cm and its inner radius is 5 cm. Find its total surface area in $cm^{2}$ (outer curved surface + inner curved surface + the two ring-shaped rims). Take π = 22/7.

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A cylindrical tube open at both ends is 20 cm long. Its outer radius is 9 cm and its inner radius is 5 cm. Find its total surface area in cm2 (outer curved surface + inner curved surface + the two ring-shaped rims). Take π = 22/7.

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Areas & Volumes practice

A cylindrical tube open at both ends is 20 cm long. Its outer radius is 9 cm and its inner radius is 5 cm. Find its total surface area in $cm^{2}$ (outer curved surface + inner curved surface + the two ring-shaped rims). Take π = 22/7.