A cylindrical tube open at the ends is made of 3 cm thick. if the external diameter is 42cm and the length of the tube is 140 cm, find the volume of the metal used in it
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VOLUME OF CYLINDER =3
DIAMETER OF CYLINDER=42
LENGTH OF TUBE=140
VOLUME OF METAL=?
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Answered by
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Answer:
outer diameter = 42 cm
outer radius = 21 cm
inner radius = 18 cm
volume of hollow cylinder = πh (R^2 -r^2 )
= 22/7×140 (441 - 324)
= 22× 20 × 117
= 51480cm^!3
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