Selina solutions

Selina solutions

Selina solutions

Grade 6

CHAPTERS

1. Number System (Consolidating the Sense of Numberness)

3. Numbers in India and International System (With Comparison)

5. Natural Numbers and Whole Numbers (Including Patterns)

6. Negative Numbers and Integers

12. Proportion (Including Word Problems)

17. Idea of Speed, Distance and Time

18. Fundamental Concepts (Algebra)

19. Fundamental Operations (Related to Algebraic Expressions)

20. Substitution (Including Use of Brackets as Grouping Symbols)

21. Framing Algebraic Expressions (Including Evaluation)

22. Simple (Linear) Equations (Including Word Problems)

23. Fundamental Concepts (Geometry)

25. Properties of Angles and Lines (Including Parallel Lines)

26. Triangles (Including Types, Properties and Construction)

30. Revision Exercise on Symmetry (Including Constructions on Symmetry)

32. Perimeter and Area of Plane Figures

Q1) Write in the form of an algebraic expression :

(i) Perimeter (P) of a rectangle is two times the sum of its length (l) and its breadth (b).

(ii) Perimeter (P) of a square is four times its side.

(iii) Area of a square is square of its side.

(iv) Surface area of a cube is six times the square of its edge.

Solution:

(i) Let P be the perimeter and be the length , and b be the breadth

P = 2(l+b)

(ii) Let P be the perimeter and a be the sides of the square

P = 4a

(iii) Let A be the area of the square and a be the sides of the square

A = a^2

(iv) Let S be the surface area and a be the edges of the cube

S = 6a^2

Still have questions? Our expert teachers can help you out

Book a free class nowNumber System (Consolidating the Sense of Numberness)

Numbers in India and International System (With Comparison)

Natural Numbers and Whole Numbers (Including Patterns)

Proportion (Including Word Problems)

Idea of Speed, Distance and Time

Fundamental Concepts (Algebra)

Fundamental Operations (Related to Algebraic Expressions)

Substitution (Including Use of Brackets as Grouping Symbols)

Framing Algebraic Expressions (Including Evaluation)

Simple (Linear) Equations (Including Word Problems)

Fundamental Concepts (Geometry)

Properties of Angles and Lines (Including Parallel Lines)

Triangles (Including Types, Properties and Construction)

Revision Exercise on Symmetry (Including Constructions on Symmetry)

Perimeter and Area of Plane Figures

Q1) Write in the form of an algebraic expression :

(i) Perimeter (P) of a rectangle is two times the sum of its length (l) and its breadth (b).

(ii) Perimeter (P) of a square is four times its side.

(iii) Area of a square is square of its side.

(iv) Surface area of a cube is six times the square of its edge.

Solution:

(i) Let P be the perimeter and be the length , and b be the breadth

P = 2(l+b)

(ii) Let P be the perimeter and a be the sides of the square

P = 4a

(iii) Let A be the area of the square and a be the sides of the square

A = a^2

(iv) Let S be the surface area and a be the edges of the cube

S = 6a^2

Still have questions? Our expert teachers can help you out

Book a free class nowLido

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