Use BezierSegment and ArcSegment as the PathFigure
<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 Stroke="Black" Grid.Row="2" Grid.Column="2" Margin="28.046,8,-20.046,0">
<Path.Data>
<PathGeometry>
<PathFigure StartPoint="20,20">
<BezierSegment Point1="10,40" Point2="200,70" />
<ArcSegment Point="100,10" Size="200,150" RotationAngle="25" IsLargeArc="False" SweepDirection="Counterclockwise"/>
</PathFigure>
</PathGeometry>
</Path.Data>
</Path>
</UserControl>
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