Warm up was to identify which of the 3 similarity shortcuts could show 2 given triangles similar and to complete a similarity statement. Went over homework, then did three types of indirect measurement problems (sunlight and shadow, artificial light and shadow, and reflected light) involving separate, overlapping, and 'adjacent' similar triangles. Then learned the Triangle Proportionality Theorem which is really just a formalized statement involving SAS~.
Notes from board
Copy of warm up handout
Homework
p. 264 #2-5 (#2 is called "Try These A")
p. 270 #16
assessment is Weds 1/24
Resources
indirect measurement with mirror vs sun shadows: link
real world indirect measurement with mirror: link
using parallel lines in triangles to create and solve proportions: link (starts at 5:09)
several good triangle proportionality theorem problems: link link2
finding missing lengths in similar triangles, helps with first hw problem: link
using triangle prop. theorem converse to show/disprove parallel (like #16) link