anonymous
  • anonymous
PLEASE PLEAS HELP I WILL MEDAL!!!! AND FAN how do you find the surface area and latreal of a clylinder?????
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
area = 2 · π · r · (r + h)=surface area
anonymous
  • anonymous
lateral area = 2*3.14*rh
anonymous
  • anonymous
A=2πrh+2πr2

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anonymous
  • anonymous
A=2πrh+2πr^2
anonymous
  • anonymous
I must be doing it wrong because ive tried both ways and i still get it wrong
anonymous
  • anonymous
what are the figures?
anonymous
  • anonymous
@lunasee
anonymous
  • anonymous
A=2πrh (for lateral area)
anonymous
  • anonymous
it says use the net to find the latreal area of the clyinder diamter is 12 hieght is 15
anonymous
  • anonymous
also says give your answer in pi , which i dont understand
anonymous
  • anonymous
im using the correct formula but i still get it wrong
anonymous
  • anonymous
since the diameter is 12 the radius will be 6 since tha radius is half of diameter
anonymous
  • anonymous
the answer i got for surface area is 791.68
anonymous
  • anonymous
@lunasee
anonymous
  • anonymous
thats the same that i got , it still says incorrect
anonymous
  • anonymous
probably approximate it
anonymous
  • anonymous
565.49 for the lateral area
anonymous
  • anonymous
nope , neither work , ive tried it all it still says its incorrect , maybe because it says it needs to be in pi?
anonymous
  • anonymous
@kalahkid
anonymous
  • anonymous
i guessing you should put pi at the end of the answer??
anonymous
  • anonymous
I have tried that too!!! This is driving me insane!!
anonymous
  • anonymous
ohhh
anonymous
  • anonymous
did you put the units cm or m^2 since its area
anonymous
  • anonymous
@lunasee
anonymous
  • anonymous
yes i did
anonymous
  • anonymous
Do you have to show working??
triciaal
  • triciaal
|dw:1433708102566:dw|
anonymous
  • anonymous
No i dont have to show my work
triciaal
  • triciaal
do you see the cylinder? surface area is made up of 2 circles area of each is Pi * r^2 where r is the radius of the circle and the lateral surface which is like a rectangle if you were to "open" down the side. the length the circumference of the circle, 2*pi* r and the width is the height of the cylinder, h
triciaal
  • triciaal
total surface area = 2*pi*r^2 + 2*pi*r*h = 2 *pi*r ( r + h)
anonymous
  • anonymous
OHHH ok now its correct!!! THANK YOU
triciaal
  • triciaal
the diameter here is 12 which is 2*r so r = 6 the height is 15 substituting in the formula use 3.14 for pi unless told to give exact
anonymous
  • anonymous
sorry for not being much help at all @lunasee at least you got the answer..............most important!!!!
anonymous
  • anonymous
@kalahkid U did help!! Thank you:) i faned!
triciaal
  • triciaal
@lunasee do you have any questions about my detailed response or you just forgot to close the question?
anonymous
  • anonymous
Nope! Just forgot to close it lol XD
triciaal
  • triciaal
ok

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