Lesson 1
Seeing cosine inside a triangle
Connect the idea to triangle structure.
Start2 Micro-lessons
Micro lesson 1
Adjacent and hypotenuse connectionMicro lesson 2
Angle controls the valueLesson 2
Using cosine in real situations
Apply cosine to measure and estimate.
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Micro lesson 1
Finding missing lengthMicro lesson 2
Checking if result makes senseLesson 3
Avoiding common cosine mistakes
Understand what breaks when cosine is misused.
Start2 Micro-lessons
Micro lesson 1
Mixing cosine with other ratiosMicro lesson 2
Wrong side selection