Help, finding the perimeter of a circle.

Question

jhannybean · Answer

Perimeter = Circumference = $\large 2 \pi r$

anonymous · Answer

|dw:1373135826651:dw|

anonymous · Answer

i got 2 pi 6.6

jhannybean · Answer

...thats a cylinder, no?

anonymous · Answer

i guess thats what its called. oops

jdoe0001 · Answer

hmmm is it like this ? |dw:1373136165512:dw|

jhannybean · Answer

So you're looking for surface area of a cylinder?

anonymous · Answer

im trying to find the perimeter of the cylinder.

jhannybean · Answer

$$\large SA = 2 \pi r^2 +2 \pi rh$$Which basically gives you the "perimeter" or ciircumference of the base, the circle,and the "perimeter" of the rectangular side.

jdoe0001 · Answer

total surface area of a cylinder = $\large 2\pi r h (h+r)$

anonymous · Answer

2pi x 6.6 x 3.2 (3.2 x 6.6)  Do i multiply like that?

jdoe0001 · Answer

well, the parenthesized term is addition, but yes

jhannybean · Answer

Now that we've got our formula, we're given $h = 3.2$ and $r=6.6$. We plug these into our formula $$\large SA = 2 \pi (6.6)^2 + 2 \pi (6.6)(3.2)$$

anonymous · Answer

i got 406.396 as my answer.

jhannybean · Answer

good job :)

jhannybean · Answer

Unless you're specified to round it up...or anything.

anonymous · Answer

It says that wasnt the right answer tho. :/ i got it wrong.

jhannybean · Answer

Really? hmm..

anonymous · Answer

Wait..it says to find the lateral area.. Did i do something wrong here?

jdoe0001 · Answer

I get 1300.46 :/

jdoe0001 · Answer

the lateral area will EXCLUDE the circular top and bottom

anonymous · Answer

What the heck.. lol none of the answers i got here are even correct. o.O

jhannybean · Answer

Oh lateral area? hmm..

jdoe0001 · Answer

heheh

jdoe0001 · Answer

can you show a picture of the material?

jhannybean · Answer

|dw:1373136530793:dw|

anonymous · Answer

I wonder what its asking for then.. D: Sure. ill try to take a screen cap.

anonymous · Answer

Gimme a sec..

anonymous · Answer

This is it.

anonymous · Answer

A.132.70 units squared
B.136.85
C.273.70
D.406.40

jdoe0001 · Answer

$\large 2 \pi r \times h$

jhannybean · Answer

Yes ^

jhannybean · Answer

Why were you asking for perimeter of a cylinder when it's asking for lateral area? xD It's completely different.

anonymous · Answer

I picked D and got tht wrong. :/ So, 2 pi times 6.6 times 3.2 ??

anonymous · Answer

I thought thats what it wanted. @.@

anonymous · Answer

But i guess i was wrong. x(

jdoe0001 · Answer

132.7

jhannybean · Answer

$$\large LA = 2 \pi r h = 2\pi (6.6)(3.2) = \ ?$$

jhannybean · Answer

I also, am getting 132.7

anonymous · Answer

i got 132.7u units squared.

anonymous · Answer

I think its right!(: thx again guys!

jdoe0001 · Answer

A.132.70 units squared
B.136.85
C.273.70
D.406.40

jhannybean · Answer

good job.