Question

(12.) Length of a rectangle is 2 times its breadth. If perimeter is 60cm, find its area​

Answer 1

Answer:

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Step-by-step explanation:

Let the length and breadth be x and 2x

Perimeter = 60 cm  

Also, Perimeter = 2(l+b)  

60 = 2 ( x + 2x )  

60 = 2 (3x)  

60 = 6x  

x = 60 / 6  

x = 10

∴Therefore, Length = 2x = 2 (10) = 20cm  

Breadth = x = 10 cm

Answer 2

Let Breadth of rectangle be X cm.

Length of rectangle = 2X cm.

Perimeter of rectangle = 60 cm

2 ( L + B ) = 60 cm

2 ( 2X + X ) = 60 cm

3X = 30

X = 30/3

X = 10 cm.

Breadth of rectangle = X = 10 cm.

And,

Length of rectangle = 2X = 2 × 10 = 20 cm.