Question

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?​

Answer 1

Answer:

2 times

Step-by-step explanation:

Perimeter of old rectangle= 2(l+b)

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

=2x2(l+b)

= 4(l+b)

Therefore, the perimeter is also doubled

Answer 2

Answer:

original Perimeter of rectangle = P

P = 2(Length+Breadth)

new perimeter= P'

new length= 2L

new breadth= 2B

P'= 2(2L+2B)

ratio of P' and P

= 2(2L+2B) / 2(L+B)

= 2 x 2(L+B)/ 2(L+B)

= 2(L+B)/ (L+B)

= 2

so, the perimeter of the rectangle will increase by 2 times..

hope it helps.