I was figuring the base (the edge with the border) to be approximately 39 inches - the height of the triangles to be about 19.5 inches - and the sloped sides to be approximately 27.6 inches - if the original poster has two full meters of fabric available.
If I was doing it, I would make a paper template from newspaper to make sure that I had it right - and that I could get all four triangles from the piece of fabric I had available - and then I could make adjustments if necessary before I cut into the fabric.
There may be another way to do it if you want all four sides to be bordered - I don't know what it would be - but someone else might.
Last edited by bearisgray; 12-15-2012 at 02:45 PM.