Selina solutions

Selina solutions

Grade 6

Framing Algebraic Expressions (Including Evaluation) | Exercise 21

Question 1

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

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subject-cta

Question 1

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

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subject-cta
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