CBSE Class 7 Mathematics Perimeter And Area Notes

Download CBSE Class 7 Mathematics Perimeter And Area Notes in PDF format. All Revision notes for Class 7 Mathematics have been designed as per the latest syllabus and updated chapters given in your textbook for Mathematics in Class 7. Our teachers have designed these concept notes for the benefit of Class 7 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 7 Mathematics for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 7 Mathematics given on studiestoday

Revision Notes for Class 7 Mathematics Chapter 11 Perimeter and Area

Class 7 Mathematics students should refer to the following concepts and notes for Chapter 11 Perimeter and Area in Class 7. These exam notes for Class 7 Mathematics will be very useful for upcoming class tests and examinations and help you to score good marks

Chapter 11 Perimeter and Area Notes Class 7 Mathematics

 

Perimeter and Area

11.1 Perimeter

A perimeter is a path that surrounds an area. The word comes from the Greek peri (around) and meter (measure). The term may be used either for the path or its length - it can be thought of as the length of the outline of a shape. The perimeter of a circular area is called circumference.

11.2  Area

Area is a quantity that expresses the extent of a two-dimensional surface or shape in the plane.

11.3  Formulae to Find Area and Perimeter

Square

If ‘a’ is the length of side of a square, then its      

i) Perimeter, P = 4 x a units

ii)Area, A = asquare units

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Note:

1.If perimeter ‘P’ of a square is given, then its side, a = P/4 units

2. If area ‘A’ of a square is given, then its side, a = Square root of A

Rectangle

If ‘l’ is the length and ‘b’ is the breadth of a rectangle, then its

i) Perimeter , P= 2 x ( l + b )  units

ii) Area, A = l x b square units

class_7_maths_concept_053

Note

i) If perimeter ‘P’ and length ‘l’ of a rectangle are given, then its breadth, b = (P/2) – units

ii) If perimeter ‘P’ and breadth ‘l’ of a rectangle are given, then its length, l = (P/2) – units

iii)  If area ‘A’ and length ‘l’ of a rectangle are given, then its breadth, b = (A/l)

iv) If area ‘A’ and breadth ‘l’ of a rectangle are given, then its length, l = (A/b)

Generalising For Other Congruent Parts of Rectangles

 If a rectangle is composed of ‘n’ number of congruent polygons, then area of each polygon = (Area of rectangle/ n)

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Note:

If area of one congruent polygon is given, then area of rectangle composed of n congruent polygon = area of each polygon x n

Parallelogram

If ‘b’ is the base and ‘h’ is the height of a parallelogram then its area,     

A = b x h sq. units   

class_7_maths_concept_055

Note:

i) If area ‘A’ and base ‘b’ of a parallelogram are given, then its height hh = (A/b)

ii) If area ‘A’ and height ‘h’ of a parallelogram are given, then its base b = (A/h)

Triangle

If 'b' is the  base  and 'h' is the height of  a triangle then its area,

class_7_maths_concept_056

Note:

i) All the congruent triangles are equal in area but the triangles equal in area need not be congruent.

ii) If area ‘A’ and base ‘b’ of a triangle are given, then its height hh = (2A/b)

iii)  If area ‘A’ and height ‘h’ of a triangle are given, then its base b = (2A/h)

Circle

If r is the radius of the circle, then its

Circumference, C = π d = π × 2units

 ii)Area, A  = π r2 square units

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CBSE Class 7 Mathematics Chapter 11 Perimeter and Area Notes

We hope you liked the above notes for topic Chapter 11 Perimeter and Area which has been designed as per the latest syllabus for Class 7 Mathematics released by CBSE. Students of Class 7 should download and practice the above notes for Class 7 Mathematics regularly. All revision notes have been designed for Mathematics by referring to the most important topics which the students should learn to get better marks in examinations. Studiestoday is the best website for Class 7 students to download all latest study material.

Notes for Mathematics CBSE Class 7 Chapter 11 Perimeter and Area

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Chapter 11 Perimeter and Area Notes for Mathematics CBSE Class 7

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Chapter 11 Perimeter and Area CBSE Class 7 Mathematics Notes

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Notes for CBSE Mathematics Class 7 Chapter 11 Perimeter and Area

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