_3: A metallic pipe whose inner diameter is 7 cm, the external diameter being 14cm and has a height of 28 cm. Find the volume of the metal.
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Answer:
Answer is 4224cm²
Step-by-step explanation:
Inner volume= πr²h
= 22/7 × 3.5 × 3.5 × 28cm²
= 22 × 3.5 × 3.5 × 4cm²
= 88cm²
Outer volume= πR²h
= 22/7 × 7 × 7 × 28cm²
= 22 × 7 × 28cm²
= 4312cm²
So, volume of metal = Outer volume - Inner volume
= πR²h - πr²h
= 4312cm² - 88cm²
= 4224cm²
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