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<Grid
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Margin="0,30,0,0">
<Canvas
x:Name="Arc1"
HorizontalAlignment="Center"
VerticalAlignment="Top">
<Path Name="Circle" Stroke="Red" StrokeThickness="5">
<Path.Data>
<PathGeometry>
<PathFigure StartPoint="0,-20">
<ArcSegment IsLargeArc="True"
Size="50, 50"
Point="0, 120"
SweepDirection="Clockwise" />
</PathFigure>
</PathGeometry>
</Path.Data>
</Path>
</Canvas>
<Canvas
x:Name="Arc2"
HorizontalAlignment="Center"
VerticalAlignment="Top">
<Path Name="Circle2" Stroke="Green" StrokeThickness="4">
<Path.Data>
<PathGeometry>
<PathFigure StartPoint="0,-25">
<ArcSegment IsLargeArc="True"
Size="50, 50"
Point="0, 125"
SweepDirection="Counterclockwise" />
</PathFigure>
</PathGeometry>
</Path.Data>
</Path>
</Canvas>
</Grid>
Sample Screenshot: http://image.ibb.co/e7Ap6G/semicircles.png