Today's lesson reviewed the in-class investigation worked by the students on 4-28.  The investigation included 17 questions and 40 small graphs to sketch.  The lesson today broke the 40 graphs into the sub categories defined by each chapter.  As a class, we discussed the conclusions and observations pertinent to each type of polar equation.  The test/large quiz on polar equations and conversions is next class.  Homework is found on page 689 19-34 of the text.