# RadiusX (Rectangle)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets or sets the x-axis radius of the ellipse that is used to round the corners of the rectangle.

```
<objectÂ RadiusX="Double" .../>
```

```
value = object.RadiusX
object.RadiusX = value
```

## Property Value

Type: Double

The x-axis radius of the ellipse that is used to round the corners of the rectangle.

This property is read/write. The default value is 0.

## Remarks

For the rectangle to have rounded corners, both the RadiusX and RadiusY properties must be non-zero.

A value that is greater than or equal to zero, and less than or equal to half the rectangle's width that describes the x-radius of the ellipse is used to round the corners of the rectangle. Values greater than half the rectangle's width are treated as equal to half the rectangle's width. Negative values are treated as positive values.