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RD Sharma Solutions Class 8 Mathematics Solutions for Surface Area and Volume of Right Circular Cylinder Exercise 22.2 in Chapter 22 - Surface Area and Volume of Right Circular Cylinder
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A hollow cylindrical pipe is 21 dm long. Its outré and inner diameters are 10 cm and 6 cm respectively. Find the volume of the copper used in making the pipe.
Answer:
We have,
Length of cylinder = 21 dm = 210 cm
Outer diameter = 10 cm
Outer radius, R = 10/2 = 5cm Inner diameter = 6 cm
Inner radius, r = 6/2 = 3cm
∴ Volume of copper used in making the pipe = π (R2 – r2)h
= 22/7 (52 - 32) 210
= 22/7 (25-9) 210
= 10560 cm3
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