Math, asked by arjunverma1034, 6 months ago

21. A hollow metal pipe is 77 cm long whose inner radius is 2 cm and outer
radius is 2.2 cm. Find the total surface area of the pipe.

Answers

Answered by saxenalavi422
5

Answer:

Given:

⇒Inner radius =

2

4

=2 cm =r

1

⇒Outer radius =

2

4.4

=2.2cm =r

2

⇒Height =77 cm

Solution:

(i) Curved S.A=2πr

1

h (inner)

=2×

7

22

×2×77=968 cm

2

(ii) Curved S.A (outer)=2πr

2

h

=2×

7

22

×2.2×77cm

2

=(22×22×2.2) cm

2

=1064.8cm

2

(iii) Total S.A of pipe = CSA of inner surface + CSA of outer surface + Area of circural base and top

=968+1064.8+2π((2.2)

2

−2π(2)

2

)

=2032.8+5.28 cm

2

=2038.08 cm

2

Answered By

toppr

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