Used peer experts to debrief selected problems from assessment. Watched a brief video on the applications of trigonometry, then discovered that similar right triangles have consistent side-length ratios that can be considered 'characteristic' of them, allowing us to identify right triangles' angle measures without measuring with a protractor. This led to the development of the 3 primary trigonometric ratios of sine, cosine, and tangent and the mnemonic (memory tool) of SohCahToa. Then played Kahoot to practice recognition of these basic ratios in right triangles.
Notes from board
Notes from board for B-day classes
Homework
p. 311 #11, 13, 14 [SRT-C6b]
Resources
basics of SohCahToa: link
more examples: link
Warm up on finding trig ratios from a triangle requiring some Pythagorean Theorem work to find the missing side. Went over homework, then looked at first problem to actually require trigonometry to find a missing side length. Worked through a few more examples, then introduced idea of inverse trigonometry to find missing angles in contrast to sides.
Notes from board
Homework
Complete this worksheet [blank copy] [LINK TO ANSWERS] (be sure your calculator is in degree mode)
Here is a good calculator online if you don't have one with trig: link
Assessment on Monday will cover these trig topics and some review topics on similarity!!
Resources
great video showing how to find missing sides and angles: link
finding missing sides and then perimeter (made by me!) link
finding missing angle measures using inverse trig (made by me!) link