Sweetandy | Yes, thank you. |

Oompa | LoganCapaldo: So RPN is just about it? |

LoganCapaldo | I dunno, I don't actually have one :) I have an 89 (but the on button is flaky, grrr) |

Oompa | heh.. I'm tempted to open it and mess with it but I'd rather if I sell it |

TRWBW | doofy2: which proof did you use? that a hemisphere + a cone = a cylinder? |

Oompa | LoganCapaldo: http://www.ticalc.org/archives/news/articles/3/34/34836.html |

doofy2 | that "proof" talks about drawing triangles on the surface and forming pyramids |

Oompa | or http://www.paxm.org/symbulator/download/rpn.html |

doofy2 | TRWBW, it of course explains the surface area first because it is dependent upon that formula |

form51 | anyone enjoy listening to Morrissey? |

saimazoon | I prefer Joplin She used to smoke crack |

TRWBW | doofy2: oh, you can do it another way. |

davock | hello i have a question of probability |

doofy2 | i just searched for that, i just know the calculus method |

TRWBW | doofy2: if you stick a cone upside down next to a hemisphere, than any horizontal slice has the same area as the slice of a cylinder |

doofy2 | davock, just ask. |

davock | A Newly married couple decides to continue having children until they have one of each sex.If the events of having a boy and a girl are independent and equiprobable, how many children should this couple expect |

TRWBW | doofy2: cone has volume pi*r^3/3, cylinder has pi*r^3, so hemispher must have (2/3)pi*r^3, and sphere (4/3)pi*r^3 |

doofy2 | TRWBW, of the same size base and height? |

TRWBW | doofy2: they all have a circular base of radius r and height r doofy2: the cone is upside down |

doofy2 | interesting, i've never seen that |

Vzoo | hi all, what's the equation of the parabole f(x) that touches the Xs in x=1/2 and that respects: u(a)=c and u(b)=c? hi all, what's the equation of the parabole f(x) that touches the Xs in x=1/2 and that respects: f(a)=c and f(b)=c? soz |

TRWBW | doofy2: it's pretty straightforward, at height h from the bottom, the slice of a hemisphere has area pi*(r^2-h^2) and the slice of the cone area pi*h^2 and the slice of the cylinder, well pi*r^2 at any height |

davock | Hint : Sumatory of i=1 --> infinity of (1^(ir^i)) = r / (1-r)^2 |

TRWBW | davock: 3 |

Vzoo | wait i've got it wrong: the parabole f touches tHe Xs in x=(a+b)/2 and has to verify f(a)=f(b)=c how do i find its equation? i don't know the english word for parabole (x^2 like curv) isn't this a very basic question? |

Tene | "parabola" |

Vzoo | close enough, what about the mathematical part of the question ; p |

fedt | so our math teacher actually calls doing volumes where the cross section is square, the floppy disk method |

prettytoney | hi |