Question

What will be the perimeter and the area of the rectangle below if it is enlarged using a scale factor of 4.5?



Perimeter = 46 cm, area = 131.25 cm2

Perimeter = 126 cm, area = 972 cm2

Perimeter = 46 cm, area = 972 cm2

Perimeter = 126 cm, area = 131.25 cm2

Answer 1

@Study_together @welshfella @hotguy @Vocaloid

Answer 2

This link might help..
http://openstudy.com/study#/updates/552d2848e4b0b938367eb73b

Answer 3

"enlarged by a scale factor of 4.5" means that the length and width each get multiplied by 4.5

old length = 8
old width = 6

new length = 4.5*(old length) = __ ?
new width = 4.5*(old width) = __ ?

Answer 4

You just multiply area and the perimeter by 4.5

Answer 5

okayy so it would be new width would be 27 the new length is 36

Answer 6

@Vocaloid you didn't multiply the area

Answer 7

And the same with the area...

Answer 8

@liana1036 right! the new width is 27 and the new length is 36

perimeter = 2(new width + new length) = ?

Answer 9

Hope it helps

Answer 10

126

Answer 11

good!

area = (new length)*(new width) = ?

Answer 12

Yes

Answer 13

good

Answer 14

972

Answer 15

excellent!

Answer 16

Yep, you got it

Answer 17

Thanks to the both of you c:

Answer 18

shortcut method:

new perimeter = 4.5*(old perimeter)
new area = 4.5*4.5*(old area)

Answer 19

np :)