Thank you for your interest in Syncfusion Products.
While using RotateTransform, it will transform the whole coordinate system to the angle mentioned.
So the default coordinates will change accordingly.
Using some mathematical calculations I have tried calculating the new coordinates.
Dim xNew As Double = x * Math.Cos(angle) - y * Math.Sin(angle)
Dim yNew As Double = x * Math.Sin(angle) + y * Math.Cos(angle)
I also attached a sample for your reference.
Please let us know if you have any concern.
Thank you for your update.
I have modified the sample according to your new image attached.
Please refer the sample, you may adjust the values to get the text in the proper destination in your document.