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Trigonometry

Cosine

A practical path to understand how cosine connects triangle sides.
Goal:
Learn how cosine relates adjacent sides to hypotenuse
3Lessons
6Micro-lessons
Not setDifficulty
Lesson 1

Seeing cosine inside a triangle

Connect the idea to triangle structure.
Start2 Micro-lessons

Micro lesson 1
Adjacent and hypotenuse connection
Micro lesson 2
Angle controls the value
Lesson 2

Using cosine in real situations

Apply cosine to measure and estimate.
Start2 Micro-lessons

Micro lesson 1
Finding missing length
Micro lesson 2
Checking if result makes sense
Lesson 3

Avoiding common cosine mistakes

Understand what breaks when cosine is misused.
Start2 Micro-lessons

Micro lesson 1
Mixing cosine with other ratios
Micro lesson 2
Wrong side selection