created by
<Canvas>
<Canvas.Resources>
<Geometry x:Key="pathData">M100,100 L200,100 200,150 A1,1 0 0 1 100,150 Z</Geometry>
</Canvas.Resources>
<Path Stroke="Blue" StrokeThickness="15" StrokeLineJoin="Round"
Data="{StaticResource pathData}"/>
<Path Stroke="Red" StrokeThickness="6" StrokeLineJoin="Round"
Data="{StaticResource pathData}"/>
</Canvas>