**Nov 20:**

define circular arcs, prove that the intersection of two circular arcs
is a circle point, derive equations for circle points, discuss implementation
of some primitives. Show how to do the comparison of *x*-coordinates by
repeated squaring. Then show that the repeated squaring strategy works for
every expression with integer operands and operators +, -, ,
and
.
State the basic separation bound theorem and show how it can be
used in a numerical sign test

**Handout: Circle Points and Predicates on Circle Points**