Trigonometry is one of the most interesting and useful chapters in Class 10 Mathematics. Chapter 3 – त्रिकोणमितीय फलन (Trigonometric Functions) helps students understand the relationship between angles and sides of a triangle. In this post, you can download the NCERT Class 10 Maths Hindi Chapter 3 PDF, which includes detailed explanations, examples, and exercises based on the NCERT syllabus.
I am writing about this topic because many students find trigonometry confusing in the beginning, especially when they study it in Hindi medium. However, once the basic ideas of ratios and angles are clear, trigonometry becomes quite simple and enjoyable. This chapter is important not only for board exams but also for advanced topics like height and distance, coordinate geometry, and physics. Understanding trigonometric functions builds a strong mathematical foundation that helps in higher classes and competitive exams too.
About NCERT Class 10 Maths Chapter 3 – त्रिकोणमितीय फलन
In this chapter, students are introduced to the basic trigonometric ratios, their relations, and how they are used in solving right-angled triangles. Trigonometry is derived from two Greek words – Trigonon (triangle) and Metron (measure). It plays a big role in measuring angles, distances, and heights in real-life applications like architecture, astronomy, and engineering.
Main Topics Covered in the Chapter
- Introduction to Trigonometric Ratios (त्रिकोणमितीय अनुपात) – Sine, Cosine, Tangent, Cotangent, Secant, and Cosecant.
- Ratios of Acute Angles – Understanding how ratios are defined for angles less than 90°.
- Trigonometric Identities – Important formulas connecting different trigonometric ratios.
- Complementary Angles – Relationship between trigonometric functions of complementary angles.
- Practical Applications – Solving real-life problems using trigonometric concepts.
Why This Chapter Is Important
Trigonometric functions are used not just in mathematics but also in various fields like physics, engineering, and architecture. For example, if you want to find the height of a building or the distance between two points that cannot be measured directly, trigonometry helps you calculate it easily. This makes it one of the most practical and scoring chapters in Class 10.
NCERT Class 10 Maths Chapter 3 PDF Download
Students can easily download the NCERT Class 10 Maths Hindi Chapter 3 – त्रिकोणमितीय फलन PDF from this website.


















