Question

the length of a rectangle is three times its breadth if the perimeter is 84 metre find the length of the rectangle ​

Answer 1

Step-by-step explanation:

perimeter = 2 ( l + b )

84 = 2 ( b + 3b )

42 = 4b

b = 10.5 m

l = 31.5 m

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Answer 2

Step-by-step explanation:

Given that,

length is three times it's breadth.

Perimeter is 84

Let, the breadth of the rectangle be x

Therefore, Length = 3x

Since,

Perimeter = 2(Length + Breadth)

=> Perimeter=2(3x + x)

=>84 = 2* 4x

=> 84 = 8x

=> x= 84/8

=> x = 10.5

Therefore Length = 3x = 3*10.5 = 31.5 metre.

Breadth = x = 10.5 metre.

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