Question
The inner radius of a hollow cylindrical pipe is 4.8 cm. If
the length of the pipe and the thickness of the pipe are 20 cm and 2.5 cm, respectively, calculate the volume of the pipe. (Use π = 22/7)Solution
ATQ,
Outer radius of the pipe = 4.8 + 2.5 = 7.3 cm
Volume of the hollow pipe = π × height × [(outer radius)² - (inner radius)²]
= (22/7) × 20 × (7.3² - 4.8²)
= (22/7) × 20 × (53.29 - 23.04)
= (22/7) × 20 × 30.25
= 1,290 cm³
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