Clockwise, IsLargeArc
<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="Purple" StrokeThickness="3"> <Path.Data> <PathGeometry> <PathFigure StartPoint="144 144"> <ArcSegment Point="240 240" Size="144 96" RotationAngle="45" SweepDirection="ClockWise" IsLargeArc="True" /> </PathFigure> </PathGeometry> </Path.Data> </Path> </UserControl>