Teacher : I went to see my folks over the weekend, and ah, I might have told you this before...
Teacher : my parents live out in the middle of the sticks.
Teacher : To get from here to there, there's no good way, it takes two hours, it's a big pain,
Teacher : and that's why I don't go there very often. But they live, you know,
Teacher : here we are, on the map, they live up here in Calhoun County. Has anybody here been to Calhoun County?
Teacher : Probably not.
Student1: I have. Me. What's near...
Teacher : Harden. Jerseyville is near there.
Student1: Oh, I've been to Jerseyville!
Teacher : Anyway. So I'm driving there on saturday with my wife,
Teacher : and I'm thinking about geometry a little bit. Not a lot, you know.
Teacher : Heh. But I'm thinking„ I see some of those grain silos,
Teacher : anybody who farm have those?
Teacher : on your farm, like the blue, harvestor ones, or do you have the the short fat ones?
Student1: I've seen the short, fat ones.
Teacher : So, I'm sitting here thinking, what if I take ...where'd it go...
Teacher : what if I take a piece of paper, and I was thinking to myself
Teacher : if I were going to model what one of those silos look like, as far as...
Teacher : Hopefully they don't do that, or you're going to have a mess, aren't you?
Teacher : So I took this piece of paper, and I taped it up, and I was thinking to myself:
Teacher : could I calculate the area that the piece of paper made, to form that cylinder?
Teacher : Could I calculate that? Just the piece of paper's area? How would I do that?
Student1: Take the um, height from the paper's height...
Teacher : Of the paper before I did that, right? So what formula would I use to do that?