Y by mahanmath, Adventure10, Mango247
We have connected four metal pieces to each other such that they have formed a tetragon in space and also the angle between two connected metal pieces can vary.
In the case that the tetragon can't be put in the plane, we've marked a point on each of the pieces such that they are all on a plane. Prove that as the tetragon varies, that four points remain on a plane.
proposed by Erfan Salavati
In the case that the tetragon can't be put in the plane, we've marked a point on each of the pieces such that they are all on a plane. Prove that as the tetragon varies, that four points remain on a plane.
proposed by Erfan Salavati
This post has been edited 1 time. Last edited by goodar2006, Sep 13, 2011, 6:54 PM