**CBSE Class 9 Maths Revised Syllabus for 2020-21 **

Maths is an interesting subject that focuses on the study of numbers, shapes and patterns. Besides, maths help to solve problems that can be related to the real world and as everything in this universe follows a pattern the subject of mathematics can be applied in many instances. The importance of the subject can also be seen like every other subject incorporates the basic knowledge of mathematics in one way or the other. CBSE Class 9 Maths Revised Syllabus for 2021-22.

**Contents**hide

**Students can access CBSE Class 9 Maths notes from the table mentioned below:**

CBSE Maths Notes For Class 9 |

Chapter 1 – Number System |

Chapter 2 – Polynomial |

Chapter 3 – Coordinate Geometry |

Chapter 4 – Linear Equations in Two Variables |

Chapter 5 – Introduction to Euclid’s Geometry |

Chapter 6 – Lines and Angles |

Chapter 7 – Triangles |

Chapter 8 – Quadrilaterals |

Chapter 9 – Areas of Parallelograms (Complete chapter removed from syllabus for 2020-21 academic session) |

Chapter 10 – Circles |

Chapter 11 – Constructions |

Chapter 12 – Heron’s Formula |

Chapter 13 – Surface Areas and Volumes |

Chapter 14 – Statistics |

Chapter 15 – Probability |

**Chapter 1 – Number System**

We use **numbers** in our day to day life. They are often called numerals. Without numbers, we cannot do counting of things, date, time, money, etc. Sometimes these numbers are used for measurement and sometimes they are used for labelling. The properties of numbers make them capable of performing arithmetic operations on them. These numbers are expressed in numeric forms and also in words. For example, 2 is written as two in words, 25 is written as twenty-five in words, etc. Students can practice writing the numbers from 1 to 100 in words to learn more.

There are different types of numbers in Maths, which we learn. They are natural and whole numbers, odd and even numbers, rational and irrational numbers, etc. We will discuss all the types here in this article. Apart from these, the numbers are used in various applications such as forming number series, maths tables, etc.

**Chapter 2 – Polynomial**

Polynomial derived from the words “poly” which means “many” and the word “nomial” which means “term”. In maths, a polynomial expression consists of variables which are also known as indeterminates and coefficients. The coefficients involve the operations of subtraction, addition, non-negative integer exponents of variables and multiplication.

**Chapter 3 – Coordinate Geometry**

Coordinate system is used to locate the position of a point in a plane using two perpendicular lines. Points are represented in the form of coordinates (x, y) in two-dimension with respect to x- and y- axes. In this article, we will learn what is Cartesian Coordinate system.

To understand the need of coordinate geometry, let us consider an example, suppose Rina is a girl in your class and she sits on the 3^{rd} column and 5^{th} row. Then this position can be represented as (3, 5).

**Chapter 4 – Linear Equations in Two Variables**

When an equation has only one variable of degree one, then that equation is known as a linear equation in one variable.

When an equation has two variables both of degree one, then that equation is known as a linear equation in two variables.

**Chapter 5 – Introduction to Euclid’s Geometry**

The word “geometry” comes from the Greek words “geo”, which means the “earth”, and “metron”, which means “to measure”. Euclidean geometry is a mathematical system attributed to Euclid, a teacher of mathematics in Alexandria in Egypt. Euclid gave us an exceptional idea regarding the basic concepts of geometry, in his book called “Elements”.

**Chapter 6 – Lines and Angles**

The chapter **Lines and Angles**, covers various concepts such as parallel lines, transversal angles, intersecting lines, interior angles are explained with the examples.

**Chapter 7 – Triangles**

In the chapter Triangles, the concept of triangles covers the following concepts such as congruency, criteria for the congruence such as SAS, SSS, ASA, AAS, RHS are explained here in detail. Two triangles are said to be congruent if all their three sides and three angles are equal. But it is necessary to find all six dimensions. Hence, the congruence of triangles can be evaluated by knowing only three values out of six. The meaning of congruent in Maths is when two figures are similar to each other based on their shape and size.

**Chapter 8 – Quadrilaterals**

A quadrilateral is a shape which has four sides. In this chapter, we are going to discuss the different types of quadrilaterals such as square, rectangle, parallelogram properties with proofs.

**Chapter 9 – Areas of Parallelograms**

In Geometry, a parallelogram is a two-dimensional figure with four sides. It is a special case of the quadrilateral. The sum of the interior angles in a quadrilateral is 360 degrees. A parallelogram has two pairs of parallel sides with equal measures. Since it is a two-dimensional figure, it has an area and perimeter.

**Chapter 10 – Circles**

- The
**set of all the points**in a plane that is at a**fixed distance**from a**fixed point**makes a circle. - A
**Fixed point**from which the set of points are at fixed distance is called the**centre**of the circle. - A circle divides the plane into 3 parts:
**interior**(inside the circle), the**circle**itself and**exterior**(outside the circle)

**Chapter 11 – Constructions**

- If a ray stands on a line then the adjacent angles form a linear pair of angles.
- If two angles form a linear pair, then uncommon arms of both the angles form a straight line.

**Chapter 12 – Heron’s Formula**

In Geometry, a triangle is a closed three-dimensional figure. In this chapter, you are going to learn the Heron’s formula for class 9, which is used to find the area of triangles. Also, how Heron’s formula is used to find the area of other polygons in detail.

**Chapter 13 – Surface Areas and Volumes**

In this chapter, the complete surface area and volume formulas for different three-dimensional shapes are discussed with the complete explanation. For any three-dimensional figures, the surface area can be broadly classified into Curved Surface Area(CSA), Lateral Surface Area (LSA), and Total Surface Area (TSA). These can be computed for 3d shapes such as a cube, cuboid, cone, cylinder and so on.

**Chapter 14 – Statistics**

A study dealing with the collection, presentation and interpretation and analysis of data is called statistics.

**Chapter 15 – Probability**

**Probability** means possibility. It is a branch of mathematics that deals with the occurrence of a random event. The value is expressed from zero to one. Probability has been introduced in Maths to predict how likely events are to happen.

The meaning of probability is basically the extent to which something is likely to happen. This is the basic probability theory, which is also used in the probability distribution, where you will learn the possibility of outcomes for a random experiment. To find the probability of a single event to occur, first, we should know the total number of possible outcomes.

**CBSE Notes for Class 9 Maths Free Download for All Chapters**

**Download PDF of NCERT Solutions for Class 9 Maths**

Chapter Name | CBSE Class 9 Maths Study Notes | NCERT Solutions Download Class 9 |

Number System | Number System Class 9 Maths notes chapter 1 | NCERT Solutions Class 9 Maths Chapter 1 Number System |

Polynomials | Polynomials Class 9 Maths notes chapter 2 | NCERT Solutions Class 9 Maths Chapter 2 Polynomials |

Coordinate Geometry | Coordinate Geometry Class 9 Maths notes chapter 3 | NCERT Solutions Class 9 Maths Chapter 3 Coordinate Geometry |

Linear Equations In two variables | Linear Equations In two variables Class 9 Maths notes chapter 4 | NCERT Solutions Class 9 Maths Chapter 4 Linear Equations In two variables |

Introduction to Euclids Geometry | Introduction to Euclids Geometry Class 9 Maths notes chapter 5 | NCERT Solutions Class 9 Maths Chapter 5 Introduction to Euclids Geometry |

Lines and Angles | Lines and Angles Class 9 Maths notes chapter 6 | NCERT Solutions Class 9 Maths Chapter 6 Lines and Angles |

Triangles | Triangles Class 9 Maths notes chapter 7 | NCERT Solutions Class 9 Maths Chapter 7 Triangles |

Quadrilaterals | Quadrilaterals Class 9 Maths notes chapter 8 | Quadrilaterals Solutions Class 9 Maths Chapter 8 |

Areas of Parallelograms and Triangles | Areas of Parallelograms and Triangles Class 9 Maths notes chapter 9 | NCERT Solutions Class 9 Maths Chapter 9 Areas of Parallelograms and Triangles |

Circles | Circles Class 9 Maths notes chapter 10 | NCERT Solutions Class 9 Maths Chapter 10 Circles |

Constructions | Constructions Class 9 Maths notes chapter 11 | NCERT Solutions Class 9 Maths Chapter 11 Constructions |

Herons Formula | Herons Formula Class 9 Maths notes chapter 12 | NCERT Solutions Class 9 Maths Chapter 12 Herons Formula |

Surface areas and Volumes | Surface areas and Volumes Class 9 Maths notes chapter 13 | NCERT Solutions Class 9 Maths Chapter 13 Surface areas and Volumes |

Statistics | Statistics Class 9 Maths notes chapter 14 | NCERT Solutions Class 9 Maths Chapter 14 Statistics |

Probability | Statistics Class 9 Maths notes chapter 15 | NCERT Solutions Class 9 Maths Chapter 15 Statistics |

**CBSE Class 9 Deleted Portion of Syllabus for 2021-202**2

**Check subject-wise details of the deducted portion of CBSE Class 9 syllabus from the following links:**

**More Reference Links –**

**Other National and International Level Olympiads**

AI Olympiad | International Artificial Intelligence Olympiad 2020-21 |

Coding Olympiad | International Coding Olympiad 2020-21 |

IMO | International Maths Olympiad 2020-21 |

ISO | International Science Olympiad 2020-21 |

KVPY | Kishore Vaigyanik Protsahan Yojana |

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