MathNet 2017-part-02 — 176 problems (EN–VI) Question 11

In the rectangle with vertices $A(-1, 0)$, $B(1, 0)$, $C(1, 1)$, $D(-1, 1)$ a point $T$ is randomly chosen. Find the probability that $T$ is closer to $A$ than to the point $P(2, 1)$.