EllipseGeometry as Resource
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<StackPanel Orientation="Horizontal">
<StackPanel.Resources>
<EllipseGeometry x:Key="pathDescription" RadiusX="100" RadiusY="50" Center="100,50" />
</StackPanel.Resources>
<Path Data="{StaticResource pathDescription}" Fill="Green" />
<Path Data="{StaticResource pathDescription}" Fill="Cyan" />
<Path Data="{StaticResource pathDescription}" Fill="Black" />
</StackPanel>
</Page>
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