Question

A metal pipe is 77cm long, the inner diameter of the cross-section is 4cm and the outer diameter is 4.8cm .find the (1) inner curved surface area (2) outer curved surface area (3) total surface area.​

Answer 1

Explanation:

(a) inner curved surface area of cylinder = πr^2h

22/7*(4)^2 *77= 3872 cm^2

(b) outer curved surface area of cylinder =πr^2h

22/7*(4.8)^2*77=5575.68 cm^2

total surface area = inner csa +outer csa

= 3872+5575.68

= 9447.68 cm^2

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