**Teacher:** |
**Now, have you thought about a cylinder
lately? ** |

**Teacher:** |
**What parts are made of it?** |

**Teacher:** |
**If I make a cylinder out
of a sheet of paper, how big is it?** |

**Teacher:** |
**How big is a sheet of
paper?** |

**Student:** |
**8 1/2 by 11** |

**Teacher:** |
**All right, so if I roll
it up can you figure out what parts are which,** |

**Teacher:** |
**like, what's the height
of the cylinder?** |

**Student:** |
**8 1/2...** |

**Teacher:** |
**'k. Do you know the formula
for volume?** |

**Teacher:** |
**I will give it to you,
but do you know what it is?** |

**Student:** |
**Base times height...** |

**Teacher:** |
**Yeah, area of the base
times the height let's see, so the volume is height squared h...** |

**Teacher:** |
**So, where is r in this
thing?** |

**Teacher:** |
**I think that's something
you're going to need to think about.** |

**Teacher:** |
**What's this part of the
cylinder? ** |

**Student:** |
**Circumference. ** |

**Teacher:** |
**And the circumference
is what?** |

**Student:** |
**hmm... right** |

**Teacher:** |
**So let's think about this.** |