NCERT Class 10 Math Chapter 6: त्रिभुज PDF Download

NCERT Class 10 Math Chapter 6 त्रिभुज (Triangles) is one of the most important chapters in geometry. This chapter focuses on the properties of triangles, similarity of triangles, criteria for similarity, areas of similar triangles, and Pythagoras theorem. It builds on the knowledge gained in earlier classes and helps students understand how shapes can be compared and analysed mathematically. The chapter is not only theoretical but also full of problem-solving opportunities that are often asked in board exams.

I wanted to write about this chapter because triangles form the backbone of geometry in Class 10. Most students find this topic challenging at first, but once the concepts of similarity and the use of theorems are clear, the problems become easy to solve. Personally, when I studied this chapter, I realised how important it is not only for board exams but also for higher classes where geometry and trigonometry go hand in hand. By practising the NCERT exercises and examples, students can gain confidence, improve their logical thinking, and prepare well for exam questions. That is why having the NCERT PDF is valuable for every student.

Key Topics in Chapter 6 त्रिभुज

This chapter covers the following important areas:

Similarity of Triangles – Concept of similar figures and conditions for similarity of triangles
Criteria for Similarity – AA (Angle-Angle), SSS (Side-Side-Side), SAS (Side-Angle-Side)
Theorems on Similarity – Relationship between areas of similar triangles
Pythagoras Theorem – Statement and proof, applications in real-life and exam problems
Problem Solving – Applying similarity and Pythagoras theorem in numerical questions

Example for Better Understanding

If two triangles have angles equal and the sides around equal angles are in the same ratio, then the two triangles are similar. For instance, a triangle drawn inside a larger triangle parallel to its base divides it proportionally – this is a direct application of the Basic Proportionality Theorem (Thales’ theorem).

Download PDF

Students can download NCERT Class 10 Math Chapter 6: त्रिभुज PDF from this website.

Download NCERT Class 11 Biology Chapter 17 Hindi PDF: गमन एवं संचलन

Movement and locomotion are two of the most exciting topics students learn in Class 11 Biology, especially in the Hindi medium. Chapter 17, गमन एवं संचलन, explains how living organisms move, how muscles function, how bones support the body, and how different systems work together to enable movement. This chapter builds a strong foundation for higher studies in biology, medicine, physiotherapy and sports science.

I am writing about this chapter because I know many students struggle to find the correct NCERT PDF in Hindi, especially when preparing for exams. Having a reliable, easy-to-download PDF helps students revise whenever needed. Chapter 17 is also important because it clears concepts that often appear in competitive exams like NEET, state-level entrance tests and school-level assessments. When students understand the basics such as types of joints, structure of muscles, skeletal system and movement disorders, it becomes much easier to answer application-based and diagram-related questions. In short, having quick access to this chapter in PDF format can really boost revision speed and help students stay confident before exams.

About NCERT Class 11 Biology Chapter 17: गमन एवं संचलन

NCERT’s Chapter 17 in the Hindi Biology textbook covers the complete mechanism of movement in humans and other organisms. It explains how our bones, muscles and joints coordinate to create motion.

The chapter mainly includes:

Types of movements
Skeletal system
Types of bones and joints
Structure of muscles
Muscle contraction process
Disorders related to movement

This chapter becomes very useful later when students study human physiology in Class 12 or prepare for entrance exams.

Key Topics Covered in Chapter 17

Here are the major concepts included in गमन एवं संचलन:

Locomotion and movement – Difference between the two, with real-life examples
Skeletal system – Axial skeleton, appendicular skeleton, functions of bones
Joints – Ball and socket, hinge joints, pivot joints, gliding joints
Muscle types – Skeletal, smooth, cardiac
Muscle structure – Sarcomere, actin, myosin
Mechanism of muscle contraction – Sliding filament theory
Disorders – Arthritis, osteoporosis, myasthenia gravis

Students often find diagrams related to muscle structure and types of joints very important for exams. So, having the PDF makes it easier to refer to the diagrams anytime.