We certainly can't draw a triangle and find the ratios of opposite, adjacent and hypotenuse because it's difficult to draw a triangle with a 225° angle!
To find sin(225°) we actually need to define a few more things and that's what took the majority of today's class. For now this is a lot of terminology and technical work, but we will find that it is very practical when it comes time to solve different types of problems.
Handouts: CAST Rule
Here are the notes:
Homework: Complete handout, P. 299 # 1-12
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