Question

Need help finding this answer

Answer 1

First option is correct.

Explanation:

Case first : Length =105m

width = 12.5 m

Perimeter formula = 2 [ length +width]

= 2 [ 105m + 12.5m ]

= 2(117.5)

=235m

Case Second when dimensions are multiplied by 2

Length = 2 (105m ) = 210 m

width = 2(12.5) = 25m

Perimeter = 2 [ 210+25]

= 2 [235]

= 470 m = 2 times 235

perimeter is increased by factor of 2.

Answer 2

Answer: The first option.

Explanation:

1. The formula for calculate the perimeter is:

P=2l+2w

Where l is the lenght and w is the width.

2. The first perimeter is:

`P_1=2(105m)+2(12.5m)=235m`

3. If you multiply the dimension by a scale of factor of 2, is the same as write the following expression:

`P_2=2(2l+2w)`

Where
`2l+2w` is the first perimeter.

4. Then:

`P_2=2(235m)=470m`