var rx = FrameBounds.Width / 2; var ry = FrameBounds.Height / 2; var cx = CenterPoint.X - pt.X; var cy = CenterPoint.Y - pt.Y; var result = Math.Pow(ry, 2) * Math.Pow(cx, 2) + Math.Pow(rx, 2) * Math.Pow(cy, 2) - Math.Pow(rx, 2) * Math.Pow(ry, 2) <= 0;
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