We used dilations to reason that SSS (3 corresponding proportional sides), AA (2 corresponding congruent angles) and SAS (2 pairs of proportional sides with congruent included angle) are all legitimate Triangle Similarity Shortcuts.
HW#3 is p 569-70: 13-15, 18-20, and pp 570-1:1-7.
Students got new seats. Homework was graded. A Geogebra sketch was used to prove that all circles are similar.