Question

what is the length of the rectangle if its perimeter is 400m and its side of the ratio is 7:3​

Answer 1

Step-by-step explanation:

perimeter=400

2×(l+b)= 400

l+b =200

now.. sides are in the ratio of 7:3

therefore we can assume the length and breadth to be 7x and 3x respectively

therefore 7x+3x=200

10x=200

X= 20

therefore length=7x=140

breadth=3x=60

Answer 2

Given :

Perimeter 'P' = 400m

The ratio of sides of the rectangle = 7:3

To find :

Length 'l' of the rectangle

Solution :

Ratio of the sides = 7:3

Then let's assume;

length 'l' = 7x ; breadth 'b' = 3x

Perimeter of a rectangle = (2 x length) + (2 x breadth)

                       P = 2l + 2b

                    P/2 = l + b = 7x + 3x = 10x

                    10x = P/2 = 200m

                        x = 20m

Therefore length = 7x = 140m

               breadth = 3x = 60m

The length of the rectangle is 140m