Lets say you have three points in $2D$, which are non-collinear: $a$, $b$ and $c$.
How can you find a $4$th point, when you have the distance from the $4$th point to $a$, $b$ and $c$ ?
Lets say you have three points in $2D$, which are non-collinear: $a$, $b$ and $c$.
How can you find a $4$th point, when you have the distance from the $4$th point to $a$, $b$ and $c$ ?
For each point a,b,c, draw a circle with center at that point, having a radius equal to its distance to 4th point. The 4th point is where all circles intersect.