Question

A hollow cylindrical pipe is 21dm long. It's outer and inner diameters are 10 cm and 6cm respectively. Find the volume of the copper used in making the pipe.​

Answer 1

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$\huge\bold\purple{Answer:-}$

⏩ We have,

h= Height of the cylindrical pipe= 21dm= 210 cm. [ since, 1dm = 10cm]

R= External radius= 10/2 cm= 5cm, r= Internal radius= 6/2 cm = 3cm.

Sol. Volume of the copper used in making the pipe = Volume of the external cylinder- Volume of the internal cylinder.

= πR²h - πr²h = π (R² - r²)h

= 22/7 × (5² - 3²) × 210 cm³

=22/7 × 16 × 210 cm³

= 10560 cm³

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Answer 2

Step-by-step explanation:

hope it helps u......❣️