Question

the area of ractangle is 12sq.meter and its lenggt is 3 times that if its breadtg what is the perimeter of rectangle
​

Answer 1

Answer:

Let length and width be l and b.

The perimeter of the rectangle is given by

2(l+b)=12

⇒l+b=6

According to the given condition

l=3+2b

⇒6−b=3+2b

⇒3b=3

b=1

Using this value of b,

l+1=6

⇒l=5

Answer 2

Step-by-step explanation:

Let the length and breadth of the rectangle be l and b respectively.

Given,

Area of rectangle = 12 m²

l × b = 12 ---(1)

and, l = 3b

Substituting l = 3b in eq 1,

3b × b = 12

3b² = 12

b² = 4

b = 2 m

Therefore, l = 3 × 2 = 6 m

Therefore, Perimeter of rectangle = 2(l + b) = 2(6 + 2) = 2 × 8 = 16 m