Someone please help me! THis makes no sense

Question

anonymous · Answer

im uploading the picture now

anonymous · Answer

Life sometimes doesn't make sense. I feel your pain.

anonymous · Answer

attachment

anonymous · Answer

cylinder ...R=2

anonymous · Answer

ya but how did you get that its supposed to be a cylinder and how did you get the radius... it makes no sense to me!

anonymous · Answer

Cylinder of radius 2 and length 4. Surface area; rectangular projection of the product of circumference and legnth, or 2πrL; top and bottom, 2 circles of πr^2, thus (2πr^2+2πrL) gives you your answer.

anonymous · Answer

can someone draw me a picture?

anonymous · Answer

Here, kas, take a pencil and rotate it about the tip. Despite being a line, it forms a circle in rotation.

Imagine the same thing, except this time with a plane and a cylinder.

anonymous · Answer

try this experiment ... take a piece of paper and make a flag ...glue the paper to a pencil or some wire .... rotate the pencil very fast and try to visualize your problem ...

anonymous · Answer

nooooo

anonymous · Answer

too confusing !

anonymous · Answer

ya im sorry im just confused

anonymous · Answer

http://en.wikipedia.org/wiki/Solid_of_revolution

anonymous · Answer

as a visual aid

mertsj · Answer

Think of a book with lots of pages.  Put the back cover against the front cover and spread out the pages.  Don't you have kind of a cylinder shape?

anonymous · Answer

http://demonstrations.wolfram.com/TheDiskMethod/

mertsj · Answer

And the radius is the width of a page.