TRWBW | Smad2: so there is a formula for the altitude of the triangle, double check me, is it h^2=w*(S-w) in this case? |

Smad2 | yeah |

mk | furst, what are you stuck on? |

TRWBW | Smad2: okay, so i think you also have, from the right triangle thing, that h^2+(w-S/2)^2=(S/2)^2 |

furst | i will show you my dumbshit work... some of it http://www.flickr.com/photos/55714008@N00/494286181/ |

TRWBW | Smad2: and i haven't done it out, but i think that's enough equations in h and w and S to show it. Smad2: well anyway that's my hint |

mk | furst, what you need to do is use two different relationships against each other to cancel H out |

furst | well the volume one h=4pi^2/r^2 |

mk | ok |

Smad2 | how'd you get that last equation, which triangle were you working on |

mk | you can solve the cost one for h too |

furst | in that screenshot i gave u |

mk | it's solved for t, not h |

furst | is the next line to be 0=0.16pir^2+0.04pirh-t ? |

mk | yep, and that = 0 |

Borg7 | could someone tell me how to calculate RMSPE (root mean squared percentage error)? |

mk | so now bring the block with h over to the other side |

TRWBW | Smad2: is it true that the distance from the midpoint of the hypoteneus of a right triangle to the vertex of the right angle is always one half the length of hypotenues? |

Smad2 | yeah |

mk | (if anyone could correct 'block' to the proper mathematical term that'd be great) (term?) |

appletizer | Borg7, take the average sum of squared errors, square root it and express it in percentage form |

TRWBW | Smad2: well that's what i'm using, that S/2 is half the hypoteneus of the triangle ABC |

Jafet | mk: Expression? |

mk | 0 = ab+cd, what cd is |

Smad2 | ah i see now :) |

TRWBW | Smad2: that is, take M to be the midpoint of AB, then you have a right triangle with MCE, where E is where the altitiude hits AB |

mk | is that an expression? |

Borg7 | appletizer: well i think that is just wrong |

TRWBW | Smad2: like i said i only did it until i got enough equations that i thought it should be solvable. but then, you asked for a "hint". might work, might not. |

Borg7 | appletizer: the percentage applies to each error |

furst | i'm just not doing the algebra correctly http://www.flickr.com/photos/55714008@N00/494258006/ |

Smad2 | :) let me try |

appletizer | Borg7, ah yes you're right sorry error expressed as percentage etc etc the rest's the same |

Borg7 | yeah i need to write a little matlab function for it |