anonymous
  • anonymous
can someone help me with surface area of a cylinder calculations
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Owlfred
  • Owlfred
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anonymous
  • anonymous
4r 10 h
amistre64
  • amistre64
whatcha got?

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anonymous
  • anonymous
i need help with surface area of a cylinder the question is 4 r and 10 h. i dont underrstand how to calculate it
amistre64
  • amistre64
radius=4 and height=10?
amistre64
  • amistre64
the surface of a cylindar is the circumferenceof the base times its height
amistre64
  • amistre64
c=2pi r 8pi in this case 8pi * 10 = 80pi for the sides
amistre64
  • amistre64
if you include the tops and bottoms you figure in for area
amistre64
  • amistre64
pi r^2 = area ; 4pi for the top and 4pi for the bottom for a total area of 88pi
amistre64
  • amistre64
ack.....
amistre64
  • amistre64
4^2 = 16 not 4 .... 80+32 = 112 112pi
anonymous
  • anonymous
let me make sure i understand this befor you go please
amistre64
  • amistre64
im here
anonymous
  • anonymous
4 X 4= 16 how did you get 8 pie
amistre64
  • amistre64
the edge of a circle equals: 2pi r , the sides of your cylinder are just the outside edge of a circle streched up to 10 right? 2pi (4) = 8pi 8pi (10) = 80pi that is the area of your sidewalls
amistre64
  • amistre64
you agree?
anonymous
  • anonymous
im in the 7th grade and trying to understand im sorry
amistre64
  • amistre64
what do you have questions about?
amistre64
  • amistre64
i cant read your mind, no matter what grade your in :)
anonymous
  • anonymous
and you are good at it. thanks for your patience. so they way got the answer is 4X4=16 and then you added 4+4 =8 X 10 = 80 +32 = 112 X 3.14 = 351.68 correct
amistre64
  • amistre64
yes, that looks to be about right...
anonymous
  • anonymous
thank you so much i think i got it. you have been very helpfull to me. have a great weekend.
amistre64
  • amistre64
youre welcome :)

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