[F8] Scribing a 3/4 Circle

[newTweener]

I want to animate the drawing of a 3/4 circle. If it were to follow the shape of a clock, I would start at 12:00 and draw around to 9:00. The effect is to scribe a line as a 3/4 circle.

I'm having difficulty doing this with a shape tween as the shape gets twisted. Shape hints maybe the answer, but can't seem to control them, and I can't use a shape tween with a motion guide.

Any suggestions this seems that it would be an elementary task?

[FlashLackey]

you could use two half-circles, animate them in a circle but mask them. one half would start with a half-circle mask opposite of it while the other half would have a quarter-circle opposite of it.

ive run into the same problem and solved it this way.