I would probably draw as accurate a map as possible, decide about where
to put the circle, go out and place a stake on each side of where I
figured it would fit, measure the distance between the stakes, divide
that in half and at the halfway mark put another stake, tie a long
string at least enough to reach one of the other stakes, then use that
as a protractor and draw the circle. If it is going over a property
line on one of the other sides, back all three stakes down the needed
distance and redraw. you may have to make the diameter smaller in order
to stay inside your perameters.
respectfully, lee