Question

The sides of rectangle are in the ratio 5:4 and it's perimeter is 90 cm find its length and breath.​

Answer 1

Answer:

let me think that length is 5x and breadth is 4x

2(5x+4x)=90cm

2(9x)=90cm

18x=90cm

x=90/18cm

x=5cm

length=5x=5*5cm=25cm

breadth=4x=4*5cm=20cm

hope it will help you.

Answer 2

$\sf{Solution}$

Step-by-step-explanation:-

Given :-

• Sides of rectangle ratio = 5:4
• Perimeter = 90cm

To find :-

Dimensions of rectangle (length, breadth)

Concept to know :-

Perimeter is nothing but sum of all sides

Perimeter of rectangle = 2(l+b)

Consideration:-

Let the sides of rectangle be

According to ratio

• Length =5x
• Breadth = 4x

Solution :-

As we know Perimeter of rectangle = 2(l+b)

But According to question perimeter =90cm

So,

90cm = 2 (l+b)

90cm = 2 (5x + 4x)

90cm = 2 (9x)

90cm = 18x

x = 90cm/18

x = 5cm

Finding length &breadth

x = 5cm

Length = 5x = 5(5) cm

Length = 25cm

Breadth = 4x

Breadth = 4(5) cm

Breadth = 20cm

• So, length = 25cm
• Breadth = 20cm

___________________________

Know more :-

Perimeter of square = 4a

Perimeter of equilateral triangle = 3a

Perimeter of scalene triangle = a+b+c

Perimeter of Iscoceles Triangle =

2a + b

Perimeter of rhombus = 4a

Perimeter of parallelogram = 2 (a+b)