Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions



This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.

now find l²=h²+(r₁-r₂)²=5929+0.16=5929.16
so, l=70

now all we have to do is to use this:

0 0 0
 We have, R = external radius =4.4/2 cm=2.2 cm
r = internal radius =42cm=2cm
h = length of the pipe = 77 cm 
Total surface area of a pipe
= Inner curved surface area + outer curved surface area + areas of two bases
= 2πrh+2πRh+2π(R2−r2)
= [968+1064.8+2×227(4.84−4)] cm
= (2032.8+447×0.84)cm²

1 5 1
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts