Question

Find the perimeters of the rectangles whose lengths and breadths are given below:

(i) 7 cm, 5 cm
(ii) 5 cm, 4 cm
(iii) 7.5 cm, 4.5 cm​

Answer 1

Perimeter of rectangle=2(L+B)
(1) length of the rectangle=7cm
Breadth of the rectangle=5cm
Perimeter of the rectangle=2*(7+5)
=2*12
=24cm
(2)length of the rectangle=5cm
Breadth of the rectangle=4cm
Perimeter of the rectangle=2*(5+4)
=2*9
=18
(3) length of the rectangle=7.5cm
Breadth of the rectangle=4.5cm
Perimeter of the rectangle=2*(7.5+4.5)
=2*12
=24

Answer 2

$\huge \underline \mathbb {SOLUTION:-}$

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(1) 7 Cm, 5 Cm

AnswEr:

• Perimeter of the rectangle = 24 Cm.

Given:

• Length of the rectangle = 7 Cm
• Breadth of the rectangle = 5 Cm

Need To Find:

• Perimeter of the rectangle = ?

ExPlanation:

Formula used here:

• Perimeter of a rectangle = 2 × (l + b)

Putting the values according to the given formula:

➠ Perimeter of the rectangle = 2 × (7 + 5)

➠ Perimeter of the rectangle = 2 × (12)

➠ Perimeter of the rectangle = 24 cm

• Hence, the perimeter of the rectangle is 24 Cm.

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(2) 5 Cm, 4 Cm

AnswEr:

• Perimeter of the rectangle = 18 Cm.

Given:

• Length of the rectangle = 5 Cm
• Breadth of the rectangle = 4 Cm

Need To Find:

• Perimeter of the rectangle = ?

ExPlanation:

Formula used here:

• Perimeter of a rectangle = 2 × (l + b)

Putting the values according to the given formula:

➠ Perimeter of the rectangle = 2 × (5 + 4)

➠ Perimeter of the rectangle = 2 × (9)

➠ Perimeter of the rectangle = 18 cm

• Hence, the perimeter of the rectangle is 18 Cm.

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(3) 7.5 Cm, 4.5 Cm

AnswEr:

• Perimeter of the rectangle = 24 Cm.

Given:

• Length of the rectangle = 7.5 Cm
• Breadth of the rectangle = 4.5 Cm

Need To Find:

• Perimeter of the rectangle = ?

ExPlanation:

Formula used here:

• Perimeter of a rectangle = 2 × (l + b)

Putting the values according to the given formula:

➠ Perimeter of the rectangle = 2 × (7.5 + 4.5)

➠ Perimeter of the rectangle = 2 × (12)

➠ Perimeter of the rectangle = 24 cm

• Hence, the perimeter of the rectangle is 24 Cm.

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Additional Information:

What is Perimeter?

• The length of the boundary of a closed figure is called the perimeter.

• Perimeter of rectangle = 2 × (Length + Breadth)
• Perimeter of a square = 4 × Side

What is Area?

• The measure of the surface enclosed by a closed figure is called area.

• Area of rectangle = Length × Breadth
• Area of a square = Side × Side

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