I also got E by dividing the area....but if there isleft over ..in the sheet is there any formula or trick to get the # of tringle ..? or drawing the figure is the only hope....
Wonderful lexieqv/tank. Tank i believe you know that, just dividing area gives maximum number of triangles if "there is no leftover". As lexieqv explained in the doc, there is a way to cut. The latter part is more important in this question.
The trick is that: Firstly you cut triangles from the one width and one length, if there's no overleft, there won't be any overleft.
In this case, 12 is divisible by 4 and 3
For sure, there won't be any overleft when you cut from one width and one length.
In short, as long as length/width
( one of the two) is sum of the triangle's two legs AND width/length
( one of the two) is the product of the triangle's two legs, there won't be overleft.