Answer
positive
Work Step by Step
1. r is always positive, because of square root
2. Let's consider quadrants and sign of (x,y) coordinates
$quadrant (x,y):$
$Quad I $ $(+,+)$
$Quad II $ $(-,+)$
$Quad III$ $(-,-)$
$Quad IV$ $ (+,-)$
3.In Q1 y is positive and x is positive , so $\frac{x}{y}$ is positive
