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Chapter 1 – Number System
Welcome to Chapter 1 Number System at AnnA Classes. This chapter is the foundation of Class 9 Maths and one of the most important chapters for your CBSE board exam. We have broken this chapter into 10 carefully structured lessons so that you learn every concept step by step — from the basics of number types all the way to laws of exponents, rationalisation and full exam practice. Here is everything you will learn in this chapter:
This course covers all 12 chapters of the NCERT Class 9 Maths syllabus
with structured, easy-to-understand study material designed for every
type of learner whether you are just starting out or preparing for
your board exams.
What you will get in this course:
- Chapter-wise Concept Notes and Theory
- Solved Examples with step-by-step explanation
- Practice MCQs (Easy, Medium and Hard)
- Assertion-Reason Questions
- Short and Long Answer Questions
- Formula Sheets for quick revision
- Mind Maps for visual learners
- CBSE Previous Year Questions (2017–2024)
- Chapter Test and Mock Papers
This course strictly follows the NCERT textbook and CBSE exam pattern.
All content is aligned with the latest CBSE 2025-26 syllabus.
Whether you want to score full marks in your school exams or build a
strong foundation for competitive exams like JEE and NTSE — this
course has everything you need.
Start learning today with AnnA Classes.
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Chapter 2 – Polynomials
Covers definition and types of polynomials monomials, binomials, trinomials. Learn zeros of a polynomial, remainder theorem, factor theorem, and algebraic identities. Includes factorization methods and practice questions with full solutions.
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Chapter 3 – Coordinate Geometry
Covers the Cartesian plane, axes, quadrants, and plotting points. Learn how to locate a point using coordinates, understand the concept of abscissa and ordinate, and represent real-life data graphically. Includes practice questions with full solutions
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Chapter-4-Linear Equations_in Two_Variables
Covers linear equations in two variables (ax + by + c = 0), finding solutions, and graphing them on a Cartesian plane. Learn about infinite solutions, equations parallel to axes, and real-life applications of linear equations. Includes practice questions with full solutions.
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Chapter 5 – Introduction to Euclid’s Geometry
Covers Euclid's definitions, axioms, and postulates. Learn the foundation of geometry, the concept of a point, line, and plane, and how Euclid's five postulates form the basis of modern geometry. Includes practice questions with full solutions.
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Chapter 6 – Lines and Angles
Covers basic terms of geometry, types of angles, intersecting and parallel lines, and related theorems. Learn angle sum property, vertically opposite angles, and transversal properties.
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Chapter 7 – Triangles
Covers congruence of triangles, congruence rules (SSS, SAS, ASA, RHS), properties of isosceles triangles, and inequalities in triangles. Includes theorem-based and practice questions with full solutions.
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Chapter 8 – Quadrilaterals
Covers types of quadrilaterals, angle sum property, properties of parallelograms, and the mid-point theorem. Learn how to prove and apply quadrilateral properties. Includes practice questions with full solutions.
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Chapter 9 – Areas of Parallelograms and Triangles
Covers the concept of area, figures on the same base and between the same parallels, and area theorems for parallelograms and triangles. Includes practice questions with full solutions.
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Chapter 10 – Circles
Covers definition of a circle, chords, arcs, subtended angles, and theorems related to circles. Learn properties of equal chords, cyclic quadrilaterals, and angle subtended at centre vs circumference. Includes practice questions with full solutions.
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Chapter 11 – Constructions
Covers geometric constructions using compass and ruler — bisecting angles, drawing perpendicular bisectors, and constructing triangles under given conditions. Includes step-by-step solved constructions.
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Chapter 12 – Heron’s Formula
Our guide on Heron's Formula Class 9 questions and answers makes it super simple. These Class 9 Maths Chapter 12 NCERT solutions explain this cool formula step by step.
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Chapter 13 – Surface Areas and Volumes
Covers surface area and volume of cuboids, cubes, cylinders, cones, spheres, and hemispheres. Includes real-life application problems and practice questions with full solutions
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Chapter 14 – Statistics
Covers collection, presentation and interpretation of data — bar graphs, histograms, frequency polygons, and measures of central tendency (mean, median, mode). Includes practice questions with full solutions.
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Chapter 15 – Probability
Covers basic concept of probability, experimental vs theoretical probability, and simple probability problems. Learn how to calculate the likelihood of events with real-life examples. Includes practice questions with full solutions.
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Find the area of any triangle even when the height is unknown! This chapter introduces Heron’s Formula, a powerful method to calculate the area of a triangle directly from its three side lengths. Students learn how to find the semi-perimeter, apply the formula step by step, and extend the technique to quadrilaterals by dividing them into triangles. Includes fully solved examples, practice problems, and real-life applications like finding areas of land plots and geometric figures.
📥 Download the full notes from the exercise file Above