Question

A metal pipe is 77cm long .inner diameter of a cross section is 4cm , the outer diameter being 4.4cm (see figure) find its
(i) inner curved surface area
(ii)outer curved surface area
(iii) total surface area​

Answer 1

Answer:

Curved surface area of cylinder=2πrh

inner surface area

radius=4/2=2cm

h=77cm

area=2*22/7*2*77

=2*22*2*11

=88*11=968cm^2

outer area=

2*22/7*2.2*77

2*22*2.2*11

44*24.2

1064.8cm^2

Total surface area

2πrh+2πr^2

1064.8+2*22/7*2.2*2.2

1064.8+30.42

1095.22cm^2

Step-by-step explanation:

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