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Deepak Bora
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The given figure shows a metal pipe 77 cm long. The inner diameter of a cross-section is 4 cm and the outer one is 4.4 cm. Find its (i) inner curved surface area (ii) outer curved surface area (iii) total surface area.

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ICSE Board Question Based on Mensuration Chapter of M.L Aggarwal for class10
In this question a figure is given which is in the form of metal pipe of a certain height given.
The inner diameter of a cross-section and the outer one is given
Find its (i) inner curved surface area (ii) outer curved surface area (iii) total surface area.
This is the Question Number 19, Exercise 17.1 of M.L Aggarwal.

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  1. Given height of the metal pipe = 77 cm

    Inner diameter = 4 cm

    Inner radius, r = d/2 = 4/2 = 2 cm

    Outer diameter = 4.4 cm

    Outer radius, R = d/2 = 4.4/2 = 2.2 cm

    (i)Inner curved surface area = 2rh

    = 2×(22/7)×2×77

    = 968 cm2

    Hence the inner surface area is 968 cm2.

    (ii)Outer curved surface area = 2Rh

    = 2×(22/7)×2.2×77

    = 1064.8 cm2

    Hence the outer curved surface area is 968 cm2.

    (iii)Area of ring = (R2-r2)

    = (22/7)×(2.22-22)

    = (22/7)×(4.84-4)

    = (22/7)×0.84

    = 2.64

    Total surface area = inner surface area + outer surface area + area of two rings

    = 968+ 1064.8+ 2×2.64

    = 2038.08 cm2

    Hence the total surface area of the metal pipe is 2038.08 cm2.

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