Question

the side of a square is 10cm how many times will the new perimeter become if the side of the square is doubled

Answer 1

Answer:

2 times will be the new perimeter to old one.      

Step-by-step explanation:

Given : The side of a square is 10 cm.

To find : How many times will the new perimeter become if the side of the square is doubled?

Solution :

The side of a square is a=10 cm.

Perimeter of the square is $P=4a$

$P=4\times 10$

$P=40$

If the side of the square is doubled.

i.e. a=2a=20

The new perimeter is

$P_n=4\times 20$

$P_n=80$

We have to find how many times the new perimeter is

i.e. $Px=P_n$

$40x=80$

$x=\frac{80}{40}$

$x=2$

Therefore, 2 times will be the new perimeter to old one.

Answer 2

Answer:

option A is right correct answer

Step-by-step explanation:

given that side of square= 4 ✖side

=4 ✖10cm=40cm.

now, new side of square = 2 ✖10cm= 20cm.

therefore,perimeter of new square= 4 ✖ side =

4 ✖ 20cm=80cm.

therefore,New perimeter = 80 = 2 ✖ 40 =2 ✖ perimeter of a original square

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