Arc and Sector code generalize

[ds1709]

I'm implementing CircularProgressBar like on the image below:

In my implementation there three modes:

• indeterminate
• percentage without text
• percentage with text

Percentage with and without text works same except control to display progress, Sector without text and Arc with text.
I noticed that code of this two controls works similar, the only difference that the first renders closed shape, and the second is not, so it looks like code duplicate. I think, code of these two classes can be generalized to base class, e.g. RotateShape or CircularShape. Also, it can be usefull in some scenarios where any of it (Sector or Arc) may be used.
For example, in my case for both controls I set StartAngle and SwepAngle, but if it will be generalized, I can work with them without duplicating code.