Question

If the length and breadth of a rectangle are doubled then its perimeter is

• A. Tripled
• B. Doubled
• C. Made half
• D. None

Answer 1

Answer: (B)

Doubled

Let length of rectangle be $l$ and breadth be $b$.

Perimeter $=2(l+b)$ ....(1)

It is given that length and breadth are doubled.

Then perimeter $=2(2l+2b)$

$=2\times 2(l+b)$

$=2\times$ perimeter ....From (1)

So, if the length and breadth of a rectangle are doubled, then its perimeter would be doubled.