Question

the length of a rectangle is three time it width of the perimeter is 84m find the length of the rectangle​

Answer 1

Step-by-step explanation:

let the length of the rectangle be 3x and breadth be x .

A/q

3x + x = 84m

4×= 84m

×= 84 ÷4

×=21

breadth= 2lm

length = 21×3= 63

Answer 2

Answer:

Perimeter of a rectangle = 84m

Let width be x cm

Length = 3x cm

A.T.Q

Perimeter of a rectangle = 84m

2 × ( length + width ) = 84m

2 × ( x cm + 3x cm ) = 84m

2 × 4x cm = 84m

8x cm = 84m

$x = \frac{84 {cm}^{2} }{8cm} \\ x = 10.5cm$

So, width is 10.5 cm

Length = 10.5 cm × 3

= 31.5 cm