Скачать или смотреть 🔥 Class 9 Maths Chapter 7 Triangles | NCERT Examples + Theorem 7.2 Explained | CBSE 2025 Must Watch!

🔥 Class 9 Maths Chapter 7 Triangles | NCERT Examples + Theorem 7.2 Explained | CBSE 2025 Must Watch!

Welcome to Desire Maths Classes — your trusted guide for Class 9 & 10 CBSE Board 2025 preparation!
In this video, we are covering Chapter 7 – Triangles (NCERT Book Examples + Theorem 7.2) in a clear, simple, and exam-focused way.

This is one of the most important Geometry chapters for the Class 9 Maths CBSE Board Exam 2025, and questions from this chapter are frequently asked in both MCQ and descriptive formats.


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🧮 What’s Covered in This Video:

We’ll go through every NCERT Example and Theorem step-by-step, ensuring you understand each concept and reasoning clearly.

📍Examples Explained:

Example 1:
In Fig. 7.8, OA = OB and OD = OC.
Show that
(i) ∆AOD ≅ ∆BOC
(ii) AD || BC

Example 2:
AB is a line segment and line l is its perpendicular bisector.
If a point P lies on l, show that P is equidistant from A and B.

Example 3:
Line segment AB is parallel to another line segment CD.
O is the midpoint of AD.
Show that
(i) ∆AOB ≅ ∆DOC
(ii) O is also the midpoint of BC.

Theorem 7.2:
Angles opposite to equal sides of an isosceles triangle are equal.


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🧠 Concepts Explained:

✅ Congruence of Triangles (SAS, ASA, SSS)
✅ Mid-point Theorem and Applications
✅ Isosceles Triangle Properties
✅ Relation between Equal Angles and Equal Sides
✅ Logical Reasoning used in Geometry Proofs
✅ Common Board-Exam-based Problems


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⏱ Video Chapters / Timestamps:

00:00 Example 1
03:49 Example 2
10:14 Example 3
16:52 Therom 7.2

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💡 Why You Should Watch This Video:

✔️ 100% NCERT Book Based
✔️ Focused on CBSE Board 2025 Exam Pattern
✔️ Complete NCERT Examples + Theorem Covered
✔️ Easy & Clear Hinglish Explanation
✔️ Step-by-Step Logical Proofs
✔️ Visual Diagrams for Better Understanding
✔️ Perfect for Quick Revision before Exams


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🧭 About Chapter 7 – Triangles (Class 9 Maths):

Triangles is one of the most scoring chapters in Class 9 Maths.
It develops understanding of geometric congruence, proof writing, and logical problem solving.
The chapter’s core focus is on congruence rules (SSS, SAS, ASA, RHS) and application in proving properties of triangles and parallel lines.
These concepts also build the foundation for Class 10 Chapter – Similar Triangles.


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🎓 Best For:

Class 9 Students (CBSE / NCERT)

Board Exam Preparation 2025

Concept Revision Before Tests

Quick Formula & Proof Recap



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🏷️

Class 9 Maths Chapter 7,
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Triangles Chapter Full Explanation,
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NCERT Book Examples Class 9,
Desire Maths Classes Chapter 7,
Class 9 Maths Triangles Examples,
Congruence of Triangles,
Triangle Theorems Class 9,
Midpoint Theorem Class 9,
NCERT Maths Exemplar Solutions,
Triangles Class 9 Important Questions,
CBSE Board 2025 Class 9 Maths,
Full Chapter Explanation Triangles Class 9


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