Class 9 Maths — NCERT

NCERT is the NCERT-prescribed textbook for Class 9 Maths in the CBSE curriculum. It contains 14 chapters covering the complete syllabus. BrainWeave offers free AI-powered solutions for every chapter — ask any question by voice or text, in Hindi or English, and get a personalized step-by-step explanation.

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What you'll study in NCERT

Across 14 chapters, Class 9 Maths introduces key concepts including Classification of Number Systems, Rational Numbers (Q), Relationships Between Number Systems, Finding Rational Numbers Between Two Numbers, Identifying Polynomials in One Variable, Terminology: Terms and Coefficients, Degree of a Polynomial, Classification by Number of Terms, The Need for a Coordinate System, The Cartesian System, Coordinates of a Point: Abscissa and Ordinate, Quadrants and Sign Conventions, and more. Every chapter below has its own page with a full topic breakdown, practice questions, fun facts, and a free AI tutor that explains each concept in Hindi or English, by voice or text.

All Chapters

Chapter 1

Chapter 1: NUMBER SYSTEMS

Classification of Number Systems · Rational Numbers (Q) · Relationships Between Number Systems · Finding Rational Numbers Between Two Numbers

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Chapter 2

Chapter 2: POLYNOMIALS

Identifying Polynomials in One Variable · Terminology: Terms and Coefficients · Degree of a Polynomial · Classification by Number of Terms

6 topics • Free AI tutor →

Chapter 3

Chapter 3: COORDINATE GEOMETRY

The Need for a Coordinate System · The Cartesian System · Coordinates of a Point: Abscissa and Ordinate · Quadrants and Sign Conventions

6 topics • Free AI tutor →

Chapter 4

Chapter 4: LINEAR EQUATIONS IN TWO VARIABLES

Definition and Standard Form of Linear Equations in Two Variables · Forming Linear Equations from Word Problems · Solution of a Linear Equation · Infinitely Many Solutions

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Chapter 5

Chapter 5: INTRODUCTION TO EUCLID'S GEOMETRY

Historical Development of Geometry · Euclid's Definitions and Undefined Terms · Distinction Between Axioms and Postulates · Euclid's Axioms

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Chapter 6

Chapter 6: LINES AND ANGLES

Basic Geometric Terms · Classification of Angles · Pairs of Angles: Complementary and Supplementary · Adjacent Angles

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Chapter 7

Chapter 7: TRIANGLES

Concept of Congruent Figures · Congruence of Triangles and CPCT · SAS (Side-Angle-Side) Congruence Rule · Application of SAS Rule in Proofs

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Chapter 8

Chapter 8: QUADRILATERALS

Diagonal Property and Congruence in Parallelograms · Properties of Opposite Sides and Angles in Parallelograms · Diagonal Bisection Property of Parallelograms · Conditions for a Quadrilateral to be a Parallelogram

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Chapter 9

Chapter 9: CIRCLES

Angle Subtended by a Chord · Theorem 9.1: Equal Chords and Angles at the Centre · Theorem 9.2: Converse of Theorem 9.1 · Theorem 9.3: Perpendicular from Centre to a Chord

7 topics • Free AI tutor →

Chapter 10

Chapter 10: HERON'S FORMULA

Heron's Formula and Semi-Perimeter · Calculating Area from Three Known Sides · Finding Area with Perimeter and Two Sides · Finding Area with Side Ratios and Perimeter

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Chapter 11

Chapter 11: SURFACE AREAS AND VOLUMES

Introduction to Right Circular Cones · Relationship between Height, Radius, and Slant Height · Curved Surface Area (CSA) of a Cone · Total Surface Area (TSA) of a Cone

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Chapter 12

Chapter 12: STATISTICS

Interpreting Bar Graphs · Constructing Bar Graphs · Distinguishing Bar Graphs and Histograms · Histograms for Uniform Width

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Chapter 13

Chapter 13: PROOFS IN MATHEMATICS

Mathematically Acceptable Statements · Identifying True, False, and Ambiguous Statements · Using Counter-examples to Disprove Statements · Restating Statements with Appropriate Conditions

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Chapter 14

Chapter 14: INTRODUCTION TO MATHEMATICAL MODELLING

Concept of a Mathematical Model · The Process of Mathematical Modelling · Formulation of a Mathematical Model · Solving the Mathematical Model

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Frequently Asked Questions

How many chapters are in Class 9 Maths?

NCERT for Class 9 Maths has 14 chapters. All are covered by BrainWeave's free AI tutor.

Is BrainWeave's Class 9 Maths content free?

Yes. The free Spark plan covers all chapters with daily message limits suitable for homework. Premium features unlock with your own free Gemini API key.

Can I ask Maths questions in Hindi?

Yes — both voice and text chat support Hindi, English, and Hinglish.

Are these solutions aligned with the latest CBSE syllabus?

Yes, BrainWeave follows the current NCERT syllabus and is updated as the syllabus changes.

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