A Polygon always closes the end points

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<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WpfApplication1" Height="352" Width="334" WindowStartupLocation="CenterScreen">
    <StackPanel>
    <Polygon Fill ="AliceBlue" StrokeThickness ="5" 
               Stroke ="Green" 
               Points ="40,10 70,80 10,50" />
    </StackPanel>
</Window>