a cylindrical metal pipe 1m long has an outer diameter of 7.2cm and an inner diameter of 2.8cm. Find the volume of metal used for the cylinder
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Correct Answer: Option A
Explanation:
Volume of cylinder pip (V) = \(\pi\)h(R\(^2\) - r\(^2\))
= 100\(\pi\)(7.2\(^2\) - 2.8\(^2\))
= 100\(\pi\)(51.84 - 7.84)
= 100\(\pi\) x 44
= 440\(\pi\)cm\(^3\)
Volume of cylinder pip (V) = \(\pi\)h(R\(^2\) - r\(^2\))
= 100\(\pi\)(7.2\(^2\) - 2.8\(^2\))
= 100\(\pi\)(51.84 - 7.84)
= 100\(\pi\) x 44
= 440\(\pi\)cm\(^3\)