Curve Tracing (Cardioid)

Note: all circles should have no fills and stage should be set to 450 x 280.5 pixels
It would be a good idea to change your stage to the said size to be able to follow.

1. Create a circle with width=50 and height=50.
2. Convert this circle to a movieclip symbol and name it "mycircle".
3. Double click the circle movieclip.
4. Create a circle again. This time it should be width=1 and height=1.
5. Convert this to a movieclip symbol and name it "mypoint".
6. Make the instance name of mypoint to "point_to_trace".
7. Change the x and y properties of mypoint to 0 and -25 respectively.
You will see a small dot on your circle.
8. Click layer1 and add a motion guide.
9. Make another circle with size width=100 and height=100 on the motion guide layer.
10. Using the eraser tool set to smallest, make a small gap on top of this circle.
11. (Motion) Tween the circle movieclip between the endpoints of the motion guide. Number of frames is 60.
12. Test your animation. You should see your circle rotating and revolving at the same time.
13. The rotation and revolution of the circle should be both clockwise. 
If they are not moving in the same direction, change  the "rotation" and "orient to path" on the properties panel.