Question

the adjoining figure shows a meta pipe 77 cm long the inner diameter of cross section is 4 cm and the outer one is 4.4 cm find itsinner curved surface area

Answer 1

Answer:

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Step-by-step explanation:

Given

Length of metal pipe (h)=77cm

Inner diameter =4cm

Outer diameter =4.4cm

So, inner radius (r)=

2

4

=2cm

And outer radius (R)=2.2cm

(i) Inner curved surface area =2πrh=2×

7

22

×2×77cm

2

=968cm

2

(ii) Outer surface area =2πRh=2×

7

22

×2.2×77=1064.8cm

2

(iii) Surface area of upper and lower rings =2[πR

2

−πr

2

]=2×

7

22

[(2.2)

2

−2

2

] cm

2

=5.28cm

2

Hence, Total surface area =(968+1064.8+5.28)cm

2

=2038.08cm

2