RectangleGeometry
<Canvas Width="300" Height="300"
xmlns="http://schemas.microsoft.com/client/2007"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Ellipse Height="200" Width="200"
Canvas.Left="30" Canvas.Top="30" Canvas.ZIndex="2"
Stroke="Black" StrokeThickness="10" Fill="Blue">
<Ellipse.Clip>
<RectangleGeometry Rect="0, 0, 100, 100"/>
</Ellipse.Clip>
</Ellipse>
<Ellipse Height="200" Width="200" Canvas.Left="30" Canvas.Top="30"
Stroke="Black" StrokeThickness="10" Fill="Blue" Opacity="0.3">
</Ellipse>
</Canvas>
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