Punjab State Board PSEB 6th Class Maths Book Solutions Chapter 7 Algebra Ex 7.2 Textbook Exercise Questions and Answers.

## PSEB Solutions for Class 6 Maths Chapter 7 Algebra Ex 7.2

1. Each side of equilateral triangle is denoted by ‘a’ then express the perimeter of the triangle using ‘a’.

Solution:

Each triangle of equilateral triangle = a

∴ Perimeter of equilateral triangle

= a + a + a = 3a

2. An isosceles triangle is shown. Express its perimeter in terms of ‘l’ and ‘b’.

Solution:

Perimeter of isosceles triangle = l + l + b

= 21 + b

3. Each side of regular hexagon is denoted by ‘S’ then express the perimeter of the regular hexagon using ‘S’.

Solution:

Each side of regular hexagon = S

Perimeter of regular hexagon

=S + S + S + S + S + S

= 6S

4. The cube has 6 faces and all of them are identify squares. If l is the length of an edge of a cube, find the total length of all edges of the cube in terms of ‘l’?

Solution:

Length of each edge of a cube = l

There are 12 edges of a cube

Total length of all edges of the cube

= 12 × l = 12l

5. Write commutative property of addition using variables x and y.

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Solution:

According to commutative property of addition.

If the order of numbers, in addition, is changed it does not change their sum.

∴ x + y = y + x

6. Write associative property of multiplication using variables l, m and n.

Solution:

According to associative property of multiplication.

If three numbers can be multiplied in any order, it does not change their product.

∴ l × (m × n) = (l × m) × n

7. Write distributive property of multiplication over addition in terms of variables p, q and r respectively.

Solution:

According to Distributive property of multiplication over addition

p × (q + r) = p × q + p × r