The 3 medians of a triangle: proof using vectors

[Guest]

How to prove, using vectors, that the 3 medians and 3 altitude lines of a triangle always intersect at one point? :?:

 

[Denis]

use http://www.google.com and you'll get lotsa sites, like:
http://sakharov.net/triangle.html

Did you seriously think someone here would type out pages
of proof stuff just for poor atomos :shock: