Use PolyBezierSegment to Simulated Circle
<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 Canvas.Left="150" Canvas.Top="150" Stroke="Black">
<Path.Data>
<PathGeometry>
<PathGeometry.Figures>
<PathFigure StartPoint="0 100">
<PolyBezierSegment
Points=" 55 100, 100 55, 100 0
100 -55, 55 -100, 0 -100
-55 -100, -100 -55, -100 0
-100 55, -55 100, 0 100" />
</PathFigure>
</PathGeometry.Figures>
</PathGeometry>
</Path.Data>
</Path>
</UserControl>
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