Hassan
I've just managed to draw an arc in Circuit CAM. The method is there in the help file but not that obviuos. I don't find the circuit CAM help too helpful myself.
What you do is this:
Click the Start a Path tool on the Graphics toolbar.
Click to start the path, then click somewhere to end it.
This will make a straight line.
After you have clicked to start the path you will notice that the Arc tool is available.
When you have made the straight line click on the Arc tool. There should then be an arc formed between the ends of your line. Move the mouse to size the arc.
You can then click and make another point and continue making a more complex curve.
Look up Draw arc in the help index. There is another way to make an arc, but I've not investigated that.
I hope that this is enough to get you going before your deadline.
Good luck
Peter