Let's say I have $3$ points, $A, B,$ and $C$. Each point has a fixed distance to every other point.
If I want to find the right representation for those distances, I have to place $A$ and $B$ according to their distance, draw two circles respectively with center $A$ and $B$ and $d(A, C)$ radius and $d(B, C)$ radius.
The two intersections of the circles are the possible place where I can put $C$ and have the right distance between every point. Pretty simple.
My problem is the following: How do I do the exact same thing with $4$ points $A, B, C,$ and $D$ ?
The two options for placing my $C$ point never allow me to place $D$ with the right distances from every other point.
(I am sorry if this is very badly explained, I'm not a native english speaker !)