[EricH]

Originally Posted by Daniel_LaFleur

Just out of curiosity ... what sort of structure could be built out of a triangle (or triangles) with those dimensions?

Can you build anything with a negative length? (OK, so we use absolute value...)I'm not sure it's possible at all, in fact, it isn't.
42+71<342
If you have a triangle, the two shortest sides added together need to be longer than the longest side. This doesn't fit the bill.