---
name: "math/atan2"
module: "math"
section: "Trigonometry"
---
Two-argument inverse tangent. Returns the angle in radians between the positive x-axis and the point (x, y).
```sema
(math/atan2 1 1) ; => ~0.7854 (π/4)
(math/atan2 0 -1) ; => ~3.1416 (π)
```