Question 24029
This is really not clear what you mean.  First of all a triangle has an AREA, not a SURFACE AREA.  Surface area refers to the area of a three dimensional figure.  


Also, I'm confused that you have width, length, and height of a triangle.  Perhaps you meant to give the three sides of a triangle being 4 m, 2.5 m, and 6.5 m, where the height of the triangle is 6 m.  It would also be important to state which sides are the "base" and the "height" since they must be mutually perpendicular.  


I'm sorry, I just can't picture this triangle.  Perhaps you could clarify and repost it.


R^2 at SCC