# CBSE Class 9 Maths 2020-21

**Chapter 1 – Number Systems**

This chapter covers concepts such as rational numbers, irrational numbers, laws of exponents, real numbers and representation of numbers on a number line.

**Chapter 2 – Polynomials**

Different types of polynomials like trinomials, monomials, linear polynomials, constant polynomials and more.

**Chapter 3 – Coordinate Geometry**

Understand how to work with the XY plane. Also, learn about plotting points correctly on a graph paper with accurate names and notations.

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

Solving linear equations and providing a graphical representation of linear equations. Learn the equation ax + by + c = 0 in two variables.

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

Find out how Euclid’s Geometry can be used for defining geometrical shapes.

**Chapter 6 – Lines and Angles**

Parallel lines, co-interior angles, transversals, angle sum property of a triangle etc.

**Chapter 7 – Triangles**

Isosceles triangle, congruence of geometric figures, inequalities in a triangle etc.

**Chapter 8 – Quadrilaterals**

Understand the properties of quadrilaterals.

**Chapter 9 – Areas of Parallelograms and Triangles**

Area of regions, area of parallelograms and area of triangles.

**Chapter 10 – Circles**

Learn about topics such as the angle subtended by an arc of a circle, the angle subtended by a chord at a point etc.

**Chapter 11 – Constructions**

Understand how to measure 45-degree, 60-degree and 90-degree angles while studying the topic of constructions.

**Chapter 12 – Heron’s Formula**

Using Heron’s formula, learn to find the area of triangles and area of polygons.

**Chapter 13 – Surface Areas and Volumes**

Understand the problems related to the surface areas and volumes of cones, cuboids, cylinders and more.

**Chapter 14 – Statistics**

Understand how to represent data through bar graphs, histograms etc.

**Chapter 15 – Probability**

Understand the concept of the experimental approach in probability.