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The inner and outer diameter of hollow cylindrical pipe is 8 cm and 12 cm respectively. The height of cylinder is 21 cm. The curved surface area (CSA) of hollow cylindrical pipe is ____. (Take π = 22/7)


1. 1,500 cm2
2. 2,050 cm2
3. 1,320 cm2
4. 2,560 cm2

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Correct Answer - Option 3 : 1,320 cm2

Given:

Inner diameter of hollow cylindrical pipe = 8 cm

Outer diameter = 12 cm

Height of cylinder (h) = 21 cm

Concepts used:

CSA of hollow cylinder = 2π × (r + R) × h

Calculation:

Inner radius (r) of cylindrical pipe = ½ × Inner diameter of cylinder = 8/2 cm = 4 cm

Outer radius (R) of cylinder = ½ × Outer diameter of cylinder = 12/2 cm = 6 cm

CSA of hollow cylindrical pipe = 2 × 22/7 × (4 + 6) × 21 cm2

⇒ CSA = 1,320 cm2

∴ CSA of hollow cylindrical pipe is equal to 1,320 cm2.

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