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in Perimeter and Area of Plane Figures by (32.3k points)
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If the length and breadth of a rectangle are doubled, how many times the perimeter of the old rectangle will that of the new rectangle be?

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Let the length of the old rectangle be l and breadth be b. 

∴ Perimeter of old rectangle = 2(l + b) 

Length of new rectangle = 2l and breadth = 2b 

∴ Perimeter of new rectangle = 2(2l + 2b) 

= 2 x 2 (l + b) 

= 2 x perimeter of old rectangle 

∴ The perimeter of new rectangle will be twice the perimeter of old rectangle.

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