List the coordinates of the vertices of triangle PQR.

Point P is located at $x=1$ and $y=2$.
So, the coordinates of P are $(1, 2)$.

Point Q is located at $x=2$ and $y=1$.
So, the coordinates of Q are $(2, 1)$.

Point R is located at $x=1.5$ (halfway between 1 and 2) and $y=2$.
So, the coordinates of R are $(1.5, 2)$.

The coordinates are:
P: $\boxed{(1, 2)}$
Q: $\boxed{(2, 1)}$
R: $\boxed{(1.5, 2)}$