Three vertices of a cube are $P=(7,12,10)$, $Q=(8,8,1)$, and $R=(11,3,9)$. What is the side length of the cube?
We compute \[\begin{aligned} PQ &= \sqrt{(7-8)^2 + (12-8)^2 + (10-1)^2} = 7\sqrt{2}, \\ QR &= \sqrt{(8-11)^2 + (8-3)^2 + (1-9)^2} = 7\sqrt{2}, \\ PR &= \sqrt{(7-11)^2 + (12-3)^2 + (10-9)^2} = 7\sqrt{2}. \end{aligned}\]Thus, $PQR$ is an equilateral triangle made from three vertices of a cube. It follows that each side of $PQR$ must be a face diagonal of the cube, so the side length of the cube is $\boxed{7}.$
[asy]
import three;
triple A=(0,0,0),B=(0,0,1),C=(0,1,1),D=(0,1,0),E=A+(1,0,0),F=B+(1,0,0),G=C+(1,0,0),H=D+(1,0,0);
draw(A--B--C--D--A^^E--F--G--H--E^^A--E^^B--F^^C--G^^D--H);
draw(B--D--E--B,dashed);
label("$P$",B,N);
label("$Q$",D,SE);
label("$R$",E,SW);
[/asy]