Answer
$(1,\pi)$
Work Step by Step
The point $(-1,0)$ lies on the $x$-axis a distance of $1$ unit from the pole (origin), so $r=1$.
A ray with vertex at the pole through $(-1,0)$ forms an angle $\theta=\pi$ (counterclockwise) with the polar axis.
Polar coordinates for this point can be given by $(1,\pi)$.
