Question

The length of a rectangle is twice as long as its width. If the perimeter of the rectangle is 336 millimetres, find its length.​

Answer 1

Answer:

length of rectangle = 112mm

Step-by-step explanation:

let width = x mm

length 2x mm

perimeter = 336 mm

2(l+b) = 336

2( 2x+x) = 336

2×3x = 336

6x = 336

x= 336/6

x= 56mm

width = 56mm

length = 56×2 = 112mm

Answer 2

Given,

Length of a rectangle is twice as long as its width.

Perimeter of the rectangle = 336 mm

To find,

The length of the rectangle.

Solution,

We can simply solve this mathematical problem by using the following mathematical process.

Let, the width of the rectangle = x mm

So, the length of the rectangle = (2 × x) = 2x mm

Thus,

The perimeter of the rectangle :

= 2 × (Length + Width)

= 2 × (x+2x)

= 2 × 3x

= 6x mm

According to the data mentioned in the question,

6x = 336

x = 336/6

x = 56

So,

The width of the rectangle = 56 mm

And,

The length of the rectangle = 2 × 56 = 112 mm

Hence, the length of the rectangle is 112 mm