Question

the perimeter of a rectangular shaped parking lot is 420 meters the length is twice the width find both dimensions

Answer 1

P= 420m

Implies 2(l+b)=420m

l+b=210m

Given that l = 2b

=> l+b = 2b + b = 210m

3b. = 210m

b. = 70m

l = 2b

= 2(70m)

= 140m

Ans) length is 140m, breadth is 70m

Answer 2

Answer:

The length of rectangle is 140 metre and it's breadth is 70 metre

Step-by-step explanation:

Perimeter of a rectangle is 2 x l + 2 x b i.e. 2 ( l + b )

According to the given condition

l = 2 x b

l = 2b

Now

420 = 2 ( l + b )

420 = 2 ( 2b + b )       ( since l = 2b )

420 = 2 ( 3b )

420 = 6b

b = 420/6

b = 70 metres

Therefore l = 2b

                   = 2 x 70

                   = 140 metres

The length of rectangle is 140 metre and it's breadth is 70 metre

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