Originally Posted by **CaptainBlack**

For three triangles, since they have to be equilateral, the internal angles a

vertex are $\displaystyle \pi/3$ or 60 degrees, three times sixty is 180 degrees.

so for a regular pentagon to complete a point fill set with three triangles the

internal angle at a vertex would have to be 180 degrees, which it is not. So

[3,3,3,5] is not a point fill set (not even nearly!).

So check what you have done, it may be wrong, then check the

wording of the problem you may have misunderstood it.

RonL