Math, asked by Maths3766, 1 year ago

An iron pipe 20 cm long has exterior diameter equal to 25 cm.if the thickness of the pipe is 1 cm,find the whole surface area of the pipe.

Answers

Answered by TheAishtonsageAlvie
10
Hey there !!
Thank u for ur question
Let R , r , and h be the External radius , internal radius , and height respectively

Given that -
R = 25/2. = 12.5 cm

Internal diameter , D = 25-2 =23

r = 23/2 = 11.5

Total surface area of the pipe =

2\pi  \: h(r1 + r2) + 2\pi( {r1}^{2}  -  {r2}^{2}) \\  =  > 2 \times  \frac{22}{7}  \times 20(12.5 + 11.5) + 2 \times  \frac{22}{7} (( {12.5)}^{2}  - ( {11.5}^{2} ) \\  =  >  \frac{44 \times 480}{7}  +  \frac{1056}{7}  \\  =  >  \frac{22176}{7}  \\  =  > 3158 {cm}^{2}
Hope this helps u !!
AK02
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