Question

The perimeter of rectangle is 120 cm. If the length is 45 cm. find its breadth and area.
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Answer 1

Answer:

800 square cm.

Step-by-step explanation:

Perimeter of rectangle =

Since we are given a perimeter = 120 cm

Length = 40 cm

Now Area = Length * Breadth

= 40*20 = 800

Thus the area is 800 square cm.

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Answer 2

Given

• Perimeter of the rectangle = 120 cm
• Length of the rectangle = 45 cm

To find

• Breadth of the rectangle
• Area of the rectangle

Solution

Let the breadth of the rectangle be x cm.

Using formula,

Perimeter of the rectangle = 2(l + b)

where,

• l = length of the rectangle
• b = breadth of the rectangle

Substituting the given values,

⟶ 120 = 2(45 + x)

⟶ 120/2 = 45 + x

⟶ 60 = 45 + x

⟶ 60 - 45 = x

⟶ 15 = x

The value of x = 15.

❖ Breadth of the rectangle = 15 cm

Using formula,

Area of the rectangle = l × b

Where,

• l = length of the rectangle
• b = breadth of the rectangle

Substituting the given values,

⟶ 45 × 15

⟶ 675 cm²

❖ Area of the rectangle = 675 cm²