Question
A hollow cylindrical drum has an internal radius of 4.8 cm.
If its length is 18 cm and the thickness is 2.5 cm, calculate the volume of the drum. (Use π = 3.14)Solution
ATQ,
Outer radius of drum = 4.8 + 2.5 = 7.3 cm
Volume of hollow cylinder = π × height × [(outer radius)² - (inner radius)²]
= 3.14 × 18 × (outer radius + inner radius) × (outer radius - inner radius)
= 3.14 × 18 × (7.3 + 4.8) × (7.3 - 4.8)
= 3.14 × 18 × 12.1 × 2.5
= 3.14 × 18 × 30.25
= 1,708.05 cm³
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