# UnitSystemExtensionMethods class

Namespace: [Grasshopper2.Extensions](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.extensions.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public static class UnitSystemExtensionMethods
```

Extension methods for Eto.Drawing.SizeF, Vector2d and Vector3d.

## Methods

- [IsImperial](https://developer.rhino3d.com/api/gh2/type/grasshopper2.extensions.unitsystemextensionmethods/isimperial.md): (static) Gets whether the unit system is an imperial one. Note that Nautical Miles are defined in metres and are not considered an imperial unit system.