We must bisect as far as may be, but the division is after all to be into limbs, not parts.
In addition they learned how to bisect and trisect the angle.
After bisecting the Antiphasis, you can proceed to bisect each of the sections; and so on.
Bisect its short edges and rule a line connecting these points.
Now we do some more of that bisecting; this time we bisect EC at ...