Use GeometryGroup to combine LineGeometry, RectangleGeometry and EllipseGeometry
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<Path Grid.Column="2" Fill="AliceBlue" Grid.Row="1" Stroke="Black"
StrokeThickness="1" Margin="2,2,2,2" >
<Path.Data>
<GeometryGroup>
<LineGeometry StartPoint="0,50" EndPoint="140,50" />
<RectangleGeometry Rect="10,30,70,40" />
<EllipseGeometry Center="100,50" RadiusX="30" RadiusY="30" />
</GeometryGroup>
</Path.Data>
</Path>
</UserControl>
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