title: How to rotate an ArcSegment around ellipse center
body: <p>I have 2 shapes: one ellipse and one circle.I want to rotate circle around ellipse's center.</p>
  
  <pre><code>&lt;Path Stroke="Indigo" StrokeThickness="3" RenderTransformOrigin="0.5,0.5"
        Data="M 50 50 A 50 50 0 0 0 42.5 26.2"&gt;
        &lt;Path.RenderTransform&gt;
             &lt;RotateTransform Angle="270"/&gt;
        &lt;/Path.RenderTransform&gt;
  &lt;/Path&gt;
  &lt;Ellipse Stroke="Black" Width="50" Height="50"/&gt;
  </code></pre>
  
  <p>Here is what I want</p>
  
  <p><a href="https://i.stack.imgur.com/DgSIN.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DgSIN.jpg" alt="enter image description here"></a></p>