Through trial and error i found a system that works for students and myself.
I have large circle tracers that are 10 slice sectioned off. Students Trace
this onto their drawing paper and then while it's still on the their paper, they
tick off the lines that divide the circle. Using a ruler they connect the
lines on their circle. They label the sections a, b, a, b, etc, all around the
outside of the circle.
They then have a piece of tracing paper that is the same size as a slice
which also has their design on it. ONe side of this tracing paper we label a,
the other B. Finally, they position the tracing paper on the circle with the
corresponding letter and transfer. Flip and then transfer again, etc. This is
the only way that i know of to guarantee very accurate placement.
Any other questions please let me know. IF it's confusing I'll try again,