Question

a cylinder tube open at both ends is made of iron 3 CM if the external diameter is 42 cm and the length of the tube is 140 cm find the volume of the metal used in it​

Answer 1

height of the tube=140 cm

external diameter=42cm

external radius (R) =42/2=21 cm

thickness=3cm

internal radius (r)= external radius - thickness

=21-3=18cm

volume = pie×R²×h - pie×r²×h

=pie×h(R²-r²)

=pie×h(R-r)(R+r)

=22/7×140(21-18)(21+18)

=22×20(3)(39)

=51480 cm³

Answer 2

Answer:

51480cm^3

Step-by-step explanation:

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