Class 9 Math Chapter 6 Trigonometry Notes PDF (Free Download)

 Trigonometry is one of the most important chapters in Class 9 Mathematics. It deals with the relationship between angles and sides of a triangle. This chapter is widely used in geometry, physics, and real-life applications.

In this article, you will learn the basic trigonometric ratios, formulas, solved examples, and practice questions, along with a PDF download link.

📌 What is Trigonometry?

Trigonometry is the study of relationships between angles and sides of a right-angled triangle.

👉 It helps in:

Measuring heights and distances

Solving triangle problems

Understanding real-life situations

📐 Trigonometric Ratios

📌 Reciprocal Ratios

📊 Solved Examples

✅ Example 1:

In a right triangle, opposite = 3 and hypotenuse = 5. Find sinθ.

👉 Solution:

sinθ = 3/5

✅ Example 2:

Find cosθ when adjacent = 4 and hypotenuse = 5

👉 Solution:

cosθ = 4/5

✅ Example 3:

Find tanθ when opposite = 2 and adjacent = 1

👉 Solution:

tanθ = 2/1 = 2

📝 Practice Questions

Define trigonometry

Find sinθ if opposite = 6 and hypotenuse = 10

Find cosθ if adjacent = 3 and hypotenuse = 5

Write trigonometric identities

Find tanθ when opposite = 5 and adjacent = 2

Exam Tips

Learn all formulas clearly

Practice daily questions

Understand triangle concepts

Revise identities

You can download the complete notes from the link below:

https://drive.google.com/file/d/1hTIh8YTMrxLHjO_70qK8lfe3F4wgeRhh/view?usp=drivesdk