tell me the answer of this question please
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1dm = 10cm
21dm = 210cm
height= 210cm
outer diameter = 10cm
outer radius,R = 10/2 = 5cm
inner diameter = 6cm
outer radius = 6/2 = 3cm
Volume of pipe = πR²h +πr²h + 2πR² - 2πr²
taking π common:
Volume =π( 5²× 210+ 3²×210+2×5² - 2×3²)
=3.14(25 × 210 + 9 × 210 + 2 × 25 - 2 × 9)
=22,531.5025cm²
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