Class 9 - Mathematics CBSE Video Lectures

Chapter 2 : Polynomials

Constants & Variables; Algebraic Expressions; Terms of an algebraic Expression; Polynomials; Degree of Polynomial; Classification of Polynomial; Zeros of polynomial;

Division of Polynomials; Remainder Theorem; Factor Theorem;

Factorization of Quadratic Trinomials; Middle Spliting Term; Algebraic Identities;

Chapter 3 : Coordinate Geometry

Coordinate Geometry 1

26 Min

Basic Terms;

Coordinate Geometry 1

Coordinate Geometry 2

39 Min

Cartesian System- Coordinate axes, Quadrant; Coordinates of point on axis- Point on a Graph, Is (x,y) same as (y,x), Another meaning of x and y coordinates;

Coordinate Geometry 2

Coordinate Geometry 3

29 Min

Finding area of triangle or rectangle- Example of triangle, Examples of rectangle; Mirror image of a point- Image in x-axis, Image in y-axis; Summary;

Coordinate Geometry 3

Angles & their properties- Angles, Types of angles, Complementary angles, Supplementary angles, Angle Bisector;

Lines and Angles 1

Lines and Angles 2

64 Min

Angle Relations- Adjacent Angles, Linear Pair of Angles, Theorem 1, Theorem 2, Vertically Opposite Angles, Theorem 3;

Lines and Angles 2

Lines and Angles 3

31 Min

Parallel Lines- Transversal, Corresponding Angles, Alternate Interior Angles, Consecutive Interior Angles, Corresponding Angles Axiom;

Lines and Angles 3

Lines and Angles 4

36 Min

Properties of Alternate Interior Angles- Theorem 4, Theorem 5;

Lines and Angles 4

Lines and Angles 5

36 Min

Properties of Consecutive Interior Angles- Theorem 6, Theorem 7;

Chapter 7: Triangles

Triangles 1

30 Min

Definition of Triangle; Types of Triangles- On the basis of Sides, On The basis of Angles; Terms Related to a Triangle- Median & Centroid, Altitude & Orthocentre; Theorem 1; Exterior Angle of a Triangle- Theorem 2;

Triangles 1

Triangles 2

117 Min

Congruent Figures; Congruence of Triangles; SAS Congruence Criteria- Theorem 3, Theorem 4; ASA Congruence Criteria- Theorem 5;

Triangles 3

AAS Congruence Criteria- Theorem 6, Theorem 7;

Triangles 3

Triangles 4

59 Min

SSS Congruence Criteria- Theorem 8, RHS Congruence Criteria, Theorem 9;

Triangles 4

Triangles 5

79 Min

Inequality relations in triangle- Theorem 10, Theorem 11, Theorem 12;

RS Agrawal Solutions

Chapter Notes(Available Notes)

Chapter 8 :Quadrilaterals

Congruence of Triangles- SAS Congruence Criteria, ASA Congruence Criteria, SSS Congruence Criteria, RHS Congruence Criteria; Types of Quadrilateral- Parallelogram, Rectangle, Rhombus, Square, Trapezium, Kite;

Theorem 1; Properties of parallelogram- Theorem 2, Theorem 3;

Theorem 4; Theorem 5;

Conditions for a Quadrilateral to be a parallelogram- Theorem 6, Theorem 7, Theorem 8;

Theorem 9(Mid-point Theorem);

Theorem 10;

Area of Triangles and Parallelogram 1

Chapter 9 : Area of Triangles and Parallelogram

Area of Triangles and Parallelogram 1

30 Min

Introduction; Polygonal Regions- Triangular Regions, Rectangular Region, Polygonal Region; Area axioms;

Area of Triangles and Parallelogram 2

Area of Triangles and Parallelogram 2

56 Min

Area of parallelogam- Theorem 1, Theorem 2;

Area of Triangles and Parallelogram 3

Area of Triangles and Parallelogram 3

51 Min

Area of Triangle- Theorem 3;

Area of Triangles and Parallelogram 4

Area of Triangles and Parallelogram 4

34 Min

Relation between triangle & parallelogram- Theorem 4;

Area of Triangles and Parallelogram 5

Area of Triangles and Parallelogram 5

56 Min

Comparing Area of 2 Triangles- Theorem 5, Theorem 6, Theorem 7;

RS Aggrawal Solutions

Chapter 10 : Circles

Circles 1

26 Min

Circle & Related Terms- Geometrical definition, Position of a point, Circular Region, Secant & Tangent, Radius, Circumference, Chord & Diameter, Concentric circles, Arc of a circle, Semicircle, Minor & major Arc, Segment of a circle, Sector & Quadrant of a circle, Congruent circles and arcs;

Circles 1

Circles 2

103 Min

Properties of Chords- Theorem 1, Theorem 2, Theorem 3, Theorem 4;

Circles 2

Circles 3

48 Min

Results on Equal Chords- Theorem 5, Theorem 6;

Circles 3

Circles 4

51 Min

Angles Subtended by Arcs- Theorem 7, Theorem 8;

Circles 4

Circles 5

53 Min

Cyclic Quadrilateral & its Properties- Cyclic Quadrilateral, Theorem 10, Theorem 11;

Chapter 11 : Construction

Chapter 12 : Heron's Formula

Heron's Formula 1

34 Min

Area of a triangle by simple formula; Area of a triangle by
Heron's formula;

Heron's Formula 1

Heron's Formula 2

35 Min

Area of quadrilateral;

Chapter 13 : Surface Area and Volume

Surface Area and Volume 1

Surface Area and Volume 1

11 Min

Surface area and Volume of Cuboid, Surface area and Volume of Cube;

Surface Area and Volume 2

Surface Area and Volume 2

113 Min

Surface area and Volume of Cylinder, Surface area and Volume of Cone, Surface area and Volume of Sphere;

RD Sharma

RS Aggarwal

Chapter 14 : Statistics

Statistics 1

30 Min

Data; Presentation of Data; Understanding Basic terms;

Statistics 2

Questions;

Statistics 3

Bar Graph, Histogram, Frequency Polygon;

Statistics 3

Statistics 4