Question

the length of a rectangle is three times of his bed in the area of the rectangle is 42 CM square then find its perimeter​

Answer 1

Step-by-step explanation:

Hello mate

Here is your answer

Let the length and breadth be 3x and x respectively

Then Area = length *breadth = 3x*x= 3x ^2

But, Area = 42 cm^2

3x^2= 42

=> x^2= 42/3

=> x^ 2 = 14

=> x = √14

Breadth = √14 cm

and length = 3√14 cm

Perimeter = 2*(length +breadth)

= 2*(3√14+√14) cm

= 2*( √14(3+1))cm

=2*4√14 cm

=8√14 cm

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