# PI2_DBL

> The mathematical constant (2 * pi). Approximately 6.28. This is a f64/double precision constant. Also known as math.TAU_DBL.

## Definition

* **Type:** Field
* **Namespace:** [Unity.Mathematics](/engine/6000.5/script-reference/unity/mathematics.md)
* **Assembly:** UnityEngine.MathematicsModule

```csharp
public const double PI2_DBL = 6.283185307179586
```