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|dw:1338516177766:dw|

First, it helps to figure out what solid figure you'll get if you rotate this

Any ideas of what type of solid figure it will be?

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i have no clue.

How'd you get that? Is that like common sense or something?

then i guess by rotates they mean folded kinda??

**rotated

like rolled up?

no it's not folding in any way

one moment while I track down an animation of this

okay, thank you.

hmm not finding much sadly, but think of a propeller blade

It's alright. I got it. so what do i do after?

When it's not moving, it's in one spot...but when it spins, it resembles a circle correct?

Oh. Okay. So its a cyclinder. what do i do after?

what's the height of the cylinder?

10.

and what's the radius of the top of the cylinder?

but isn't the circumference 4?

since the whole side BC is 4?

that's not the circumference

that's actually the radius since that's as far as it goes in that direction

|dw:1338517802914:dw|

|dw:1338517841316:dw|

I don't really get how its four...

Do you see how that cylinder is created?

how'd you get it? i still dont get how you created the cylinder like that..

but how is the radius 4? wouldn't it be 2?

no, the radius is shown in the next drawing
|dw:1338519158344:dw|

and that length is exactly the length of BC

exactly, AB never move at all but the other points spin/move around

A and B never move as well

ohhh, i get it. so is the answer 160 pi?

you nailed it

Yay :) thank you so much x)

you're welcome

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