Question

A metal pipe is 2 metre long if the internal diameter and thickness of the metal are 17mm and 1mm respectively find the volume of the metal,​

Answer 1

Step-by-step explanation:

(iii) total surface area

MEDIUM

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ANSWER

Let R and r be the outer and inner radii of the metal pipe. Then,

R=2.2 cm, r=2 cm, h=77 cm

(i)S

1

=2πrh=2×

7

22

×2×77=968 cm

2

(ii)S

2

=2πRh=2×

7

22

×2.2×77=1064.8 cm

2

(iii)TSA=S

1

+S

2

+2(πR

2

−πr

2

)

=968+1064.8+2×

7

22

[(2.2)

2

−2

2

]=2028.08 cm

2