danny it looks like he already did a Triangulate on it. I think he is asking how to get it, or why get it in to Quads.

Useing triangels only is a good way for modeling for games. Using 4 sided or more. Polys is normaly how the higher poly count art models are made as its eazyer to look at them and understand how there put together. (least to me) also the deformations with skinning and other things are more predictable with 4 sided ones.

You can go in and just delit the one cross edge if you want to on this model. Or when you are makeing a new model use 4 sides alot. there isn't anything that keeps you to 3 sides with the polys.

Need more info just let us know.