One Path with two EllipseGeometries
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Canvas>
<Path Fill="Cyan" Stroke="Black">
<Path.Data>
<GeometryGroup>
<EllipseGeometry Center="20, 40" RadiusX="20" RadiusY="40" />
<EllipseGeometry Center="0, 0" RadiusX="10" RadiusY="30" />
</GeometryGroup>
</Path.Data>
</Path>
</Canvas>
</Page>
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