
CBSE Important Questions›

CBSE Previous Year Question Papers›
 CBSE Previous Year Question Papers
 CBSE Previous Year Question Papers Class 12
 CBSE Previous Year Question Papers Class 10

CBSE Revision Notes›

CBSE Syllabus›

CBSE Extra Questions›

CBSE Sample Papers›
 CBSE Sample Papers
 CBSE Sample Question Papers For Class 5
 CBSE Sample Question Papers For Class 4
 CBSE Sample Question Papers For Class 3
 CBSE Sample Question Papers For Class 2
 CBSE Sample Question Papers For Class 1
 CBSE Sample Question Papers For Class 12
 CBSE Sample Question Papers For Class 11
 CBSE Sample Question Papers For Class 10
 CBSE Sample Question Papers For Class 9
 CBSE Sample Question Papers For Class 8
 CBSE Sample Question Papers For Class 7
 CBSE Sample Question Papers For Class 6

ISC & ICSE Syllabus›

ICSE Question Paper›
 ICSE Question Paper
 ISC Class 12 Question Paper
 ICSE Class 10 Question Paper

ICSE Sample Question Papers›
 ICSE Sample Question Papers
 ISC Sample Question Papers For Class 12
 ISC Sample Question Papers For Class 11
 ICSE Sample Question Papers For Class 10
 ICSE Sample Question Papers For Class 9
 ICSE Sample Question Papers For Class 8
 ICSE Sample Question Papers For Class 7
 ICSE Sample Question Papers For Class 6

ICSE Revision Notes›
 ICSE Revision Notes
 ICSE Class 9 Revision Notes
 ICSE Class 10 Revision Notes

ICSE Important Questions›

Maharashtra board›

RajasthanBoard›
 RajasthanBoard

Andhrapradesh Board›
 Andhrapradesh Board
 AP Board Sample Question Paper
 AP Board syllabus
 AP Board Previous Year Question Paper

Telangana Board›

Tamilnadu Board›

NCERT Solutions Class 12›
 NCERT Solutions Class 12
 NCERT Solutions Class 12 Economics
 NCERT Solutions Class 12 English
 NCERT Solutions Class 12 Hindi
 NCERT Solutions Class 12 Maths
 NCERT Solutions Class 12 Physics
 NCERT Solutions Class 12 Accountancy
 NCERT Solutions Class 12 Biology
 NCERT Solutions Class 12 Chemistry
 NCERT Solutions Class 12 Commerce

NCERT Solutions Class 10›

NCERT Solutions Class 11›
 NCERT Solutions Class 11
 NCERT Solutions Class 11 Statistics
 NCERT Solutions Class 11 Accountancy
 NCERT Solutions Class 11 Biology
 NCERT Solutions Class 11 Chemistry
 NCERT Solutions Class 11 Commerce
 NCERT Solutions Class 11 English
 NCERT Solutions Class 11 Hindi
 NCERT Solutions Class 11 Maths
 NCERT Solutions Class 11 Physics

NCERT Solutions Class 9›

NCERT Solutions Class 8›

NCERT Solutions Class 7›

NCERT Solutions Class 6›

NCERT Solutions Class 5›
 NCERT Solutions Class 5
 NCERT Solutions Class 5 EVS
 NCERT Solutions Class 5 English
 NCERT Solutions Class 5 Maths

NCERT Solutions Class 4›

NCERT Solutions Class 3›

NCERT Solutions Class 2›
 NCERT Solutions Class 2
 NCERT Solutions Class 2 Hindi
 NCERT Solutions Class 2 Maths
 NCERT Solutions Class 2 English

NCERT Solutions Class 1›
 NCERT Solutions Class 1
 NCERT Solutions Class 1 English
 NCERT Solutions Class 1 Hindi
 NCERT Solutions Class 1 Maths

JEE Main Question Papers›

JEE Main Syllabus›
 JEE Main Syllabus
 JEE Main Chemistry Syllabus
 JEE Main Maths Syllabus
 JEE Main Physics Syllabus

JEE Main Questions›
 JEE Main Questions
 JEE Main Maths Questions
 JEE Main Physics Questions
 JEE Main Chemistry Questions

JEE Main Mock Test›
 JEE Main Mock Test

JEE Main Revision Notes›
 JEE Main Revision Notes

JEE Main Sample Papers›
 JEE Main Sample Papers

JEE Advanced Question Papers›

JEE Advanced Syllabus›
 JEE Advanced Syllabus

JEE Advanced Mock Test›
 JEE Advanced Mock Test

JEE Advanced Questions›
 JEE Advanced Questions
 JEE Advanced Chemistry Questions
 JEE Advanced Maths Questions
 JEE Advanced Physics Questions

JEE Advanced Sample Papers›
 JEE Advanced Sample Papers

NEET Eligibility Criteria›
 NEET Eligibility Criteria

NEET Question Papers›

NEET Sample Papers›
 NEET Sample Papers

NEET Syllabus›

NEET Mock Test›
 NEET Mock Test

NCERT Books Class 9›
 NCERT Books Class 9

NCERT Books Class 8›
 NCERT Books Class 8

NCERT Books Class 7›
 NCERT Books Class 7

NCERT Books Class 6›
 NCERT Books Class 6

NCERT Books Class 5›
 NCERT Books Class 5

NCERT Books Class 4›
 NCERT Books Class 4

NCERT Books Class 3›
 NCERT Books Class 3

NCERT Books Class 2›
 NCERT Books Class 2

NCERT Books Class 1›
 NCERT Books Class 1

NCERT Books Class 12›
 NCERT Books Class 12

NCERT Books Class 11›
 NCERT Books Class 11

NCERT Books Class 10›
 NCERT Books Class 10

Chemistry Full Forms›
 Chemistry Full Forms

Biology Full Forms›
 Biology Full Forms

Physics Full Forms›
 Physics Full Forms

Educational Full Form›
 Educational Full Form

Examination Full Forms›
 Examination Full Forms

Algebra Formulas›
 Algebra Formulas

Chemistry Formulas›
 Chemistry Formulas

Geometry Formulas›
 Geometry Formulas

Math Formulas›
 Math Formulas

Physics Formulas›
 Physics Formulas

Trigonometry Formulas›
 Trigonometry Formulas

CUET Admit Card›
 CUET Admit Card

CUET Application Form›
 CUET Application Form

CUET Counselling›
 CUET Counselling

CUET Cutoff›
 CUET Cutoff

CUET Previous Year Question Papers›
 CUET Previous Year Question Papers

CUET Results›
 CUET Results

CUET Sample Papers›
 CUET Sample Papers

CUET Syllabus›
 CUET Syllabus

CUET Eligibility Criteria›
 CUET Eligibility Criteria

CUET Exam Centers›
 CUET Exam Centers

CUET Exam Dates›
 CUET Exam Dates

CUET Exam Pattern›
 CUET Exam Pattern
Indian Certificate of Secondary Education (ICSE) is an esteemed and wellrecognized board that operates across India. For candidates who plan on getting their higher degrees from foreign universities and colleges, ICSE serves to make ends meet. The board has a great reputation among the foreign academic circles and therefore their syllabus is highly based on an international curriculum. ICSE has been known for its vast syllabus and students are apprehensive before exams. The ICSE Class 9 Mathematics Revision Notes Chapter 20 revolves primarily around the core subjects and the subjects are not integrated, unlike other boards. The extensive and rigorous syllabus can only be dealt with regular revision of the numericals, concepts, and Formulas.
Mathematics being a core subject, the student has to be well versed and completely accustomed to the question patterns, the formulas, and the different types of numerical to prove their understanding of the concepts during exams. . Extramarks, therefore, released the ICSE Class 9 Mathematics Revision Notes Chapter 20 to arm the students with the ICSE Solutions which adheres to the ISC & ICSE Syllabus. These notes are compiled and curated by the Extramarks subject experts after referring to the top educators and professionals in the field who are well versed with the problems faced by students and how to handle those important topics to help to all students irrespective of their learning capacities.
Revision Notes for ICSE Class 9 Mathematics Chapter 20 – Free PDF Download
Students must practice the ICSE Class 9 Mathematics Revision Notes Chapter 20 to score well. Mathematics is one such subject where getting full marks is a great possibility, teachers advise preparing this subject thoroughly because that can boost the final percentage of students significantly. . The educators appointed to check marksheets by the ICSE council, and shared their experiences. The first and foremost thing has already discussed is regularly practising ICSE Class 9 Mathematics Revision Notes Chapter 20.
Secondly, it has been observed by students and teachers alike that ICSE Important Questions often merge two different topics and therefore selective learning, unlike popular conceptions, can be counterproductive. What is advised is practising numerical from sections from the prescribed textbook , regularly. Therefore, the ICSE Class 9 Mathematics Revision Notes Chapter 20 provides a detailed summary of Chapter 20 Area and Perimeter of Plane Figures Class 9 ICSE. Last but not least, the revision notes are a compilation of all the formulas and axioms that are discussed in the chapter and then there are many solved problems curated by referring to the ICSE Sample Question Papers, ICSE important questions, and past years’ ICSE Question Paper must be practised to strengthen the base. Mathematics is a subject that becomes fun and less challenging when one spends more time practicing Mathematics on a daily basis and is consistent in his approach, and is bound to excel.
Introduction to the Chapter
Chapter 20 of ICSE Mathematics is Area and Perimeter of Plane Figures Class 9, and it belongs to the Geometry and Mensuration section of the syllabus. Students already have a basic understanding of shapes studied in the previous classes therefore the chapter takes on first revising those concepts before moving to the next level. . The ICSE Class 9 Mathematics Revision Notes Chapter 20 is primarily with the basic shapes like triangle, square, and rectangle. Then as the chapters progress, the student learns about figuring out the area and perimeter of different kinds of triangles. Students learn that each type of triangle has a separate formula.. They also learn how to calculate the area and perimeter of these triangles when one of the data is not given.
The chapter then takes on quadrilaterals, and it is a very broad topic in the syllabus. ICSE Class 9 Mathematics Revision Notes Chapter 20 has a separate section for all the quadrilaterals, and it has labelled diagrams with the derivations of all formulas. There are pictorial numericals and word problems. The ICSE Class 9 Mathematics Revision Notes Chapter 20 cover both kinds of problems. The last section of the chapter is the introduction to the circle and how to calculate its area and circumference (perimeter). The major ideas that are discussed in these notes are perimeter and Area of Plane Figures Class 9.
Topics Covered in ICSE Mathematics Chapter 20 of Class 9
Geometry and Mensuration are vast topics with numerous exercises in the ICSE Class 9 Mathematics Revision Notes Chapter 20. In triangles, the students learn about Heron’s formula which is a universal formula that can be used to calculate the area of any triangle with just the measurement of all three sides of the triangle. The three different types of triangles are discussed – equilateral, isosceles, and scalene, and also their characteristics.
Moving onto quadrilaterals as can be seen in the ICSE Class 9 Mathematics Revision Notes Chapter 20 different and new varieties of quadrilaterals are discussed. Their characteristics and the formulas and their derivations to calculate their area and perimeter have been explained.. The different types of quadrilaterals discussed in the ICSE Class 9 Mathematics Revision Notes Chapter 20 are – rectangle, square, parallelogram, rhombus, and trapezium.
As the chapter comes to an end the student also learns about the circle and how to calculate the area and the circumference of the circle. In the process, they also learn about a constant called pi (π) whose value equals 3.14 or 22/7. All the formulas and the derivations are very magnanimously described in the ICSE Class 9 Mathematics Revision Notes Chapter 20. Students across the country have given a very positive response to these notes and look forward to using study materials for competitive exams provided by Extramarks because students have complete faith and trust in Extramarks.
Chapter wise ICSE Class 9 Math Revision Notes
FAQs (Frequently Asked Questions)
1. How can students avoid common mistakes during problemsolving?
As teachers have discussed, many students have been observed using calculators while solving problems at home and this is not advisable because the more calculations are practised the lesser the chance to make avoidable errors. The other key to refrain yourself from making mistakes is to practice mindfulness and having a positive and calm mind during the problemsolving process. Students must take the ICSE Revision Notes seriously if they wish to improve their score and boost their performance.
2. How to remember all the formulas because there are so many?
Remembering the plethora of mathematical formulas has been a constant cause of concern among students and the best way to deal with this regular problemsolving and having all the formulas compiled in one place can be a daunting task for students but not anymore! Students can simply go through the revision notes, that itself will take care of everything. Therefore, the ICSE Class 9 Mathematics Revision Notes Chapter 20 immensely helps because they have all the formulas at one place and students can visit them regularly before they even realise it, it’s ingrained in their mind.