- anonymous

PLEASE PLEAS HELP I WILL MEDAL!!!! AND FAN
how do you find the surface area and latreal of a clylinder?????

- chestercat

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- anonymous

area = 2 · π · r · (r + h)=surface area

- anonymous

lateral area = 2*3.14*rh

- anonymous

A=2πrh+2πr2

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## More answers

- anonymous

A=2πrh+2πr^2

- anonymous

I must be doing it wrong because ive tried both ways and i still get it wrong

- anonymous

what are the figures?

- anonymous

- anonymous

A=2πrh (for lateral area)

- anonymous

it says use the net to find the latreal area of the clyinder diamter is 12 hieght is 15

- anonymous

also says give your answer in pi , which i dont understand

- anonymous

im using the correct formula but i still get it wrong

- anonymous

since the diameter is 12 the radius will be 6 since tha radius is half of diameter

- anonymous

the answer i got for surface area is 791.68

- anonymous

- anonymous

thats the same that i got , it still says incorrect

- anonymous

probably approximate it

- anonymous

565.49 for the lateral area

- 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

i guessing you should put pi at the end of the answer??

- anonymous

I have tried that too!!! This is driving me insane!!

- anonymous

ohhh

- anonymous

did you put the units cm or m^2 since its area

- anonymous

- anonymous

yes i did

- anonymous

Do you have to show working??

- triciaal

|dw:1433708102566:dw|

- anonymous

No i dont have to show my work

- 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

total surface area = 2*pi*r^2 + 2*pi*r*h
= 2 *pi*r ( r + h)

- anonymous

OHHH ok now its correct!!! THANK YOU

- 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

sorry for not being much help at all @lunasee at least you got the answer..............most important!!!!

- anonymous

@kalahkid U did help!! Thank you:) i faned!

- triciaal

@lunasee do you have any questions about my detailed response or you just forgot to close the question?

- anonymous

Nope! Just forgot to close it lol XD

- triciaal

ok

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