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# Mathematics

A cylindrical pipe 28m long. Its internal radius is 3.5cm and external radius is 5cm. Calculate the volume in cm of metal used in making the pipe (2) the volume of water in metres that the pipe can hold.

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1. Pls send the answer for me

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2. since the area of a circle is πr^2, the volume of metal is
2800π(5^2 - 3.5^2) = 112,154 cm^3
the water volume (inside only) is 28π*0.035^2 = 0.11 m^3

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oobleck
3. (2) internal volume = π * 3.5^2 * 2800 ... cm^3

external volume = π * 5^2 * 2800 ... cm^3

the difference in the volumes is the volume of metal in the pipe ... cm^3

volumes are measured in cubic units ... 1E6 cm^3 = 1 m^3

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4. A cylinder pipe is 28m long. It's internal radius is 3.5cm and external radius is 5cm. Calculate the volume in cm3

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5. Answer

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