## help123please. 2 years ago Two rectangles are similar. Rectangle ABCD has a length of 5 in and a width of 10 in. Rectangle ABCD is dilated by a scale factor of 4 to form rectangle FGHJ. Answer these questions using the information provided: 1. How is the area affected by the dilation? 2. How is the perimeter affected by the dilation?

to get the length and the width of rectangle of FGHJ, just multiply by 4 from the length and the width of rectangle ABCD. so, l = 4 * 5 = 20 w = 4 * 10 = 40 now, to get area use the formula : area = length * width = 20 * 40 = .... in

It might take a few mins,ok?

60 in,yes?

for perimeter of rectangle FGHJ, use the formula : perimeter = 2(l+w) = 2(20+40) = 2 * 60 = ... in

yes, that's right sorry, the unit for area must be in squared not in :)

ok, thank u! so, how should I state my answer?

You can call me '123', by the way.

oppss.. my eyes still want to bed, @123 :) area = 20 * 40 = 80 in^2 not 60 (sorry) perimeter = 2(20+40) = 2(60) = 120 in

lol. :D

opss.. 20 * 40 = 800 not 80 my stupid --"

nope. so, what should i write for number 1?

800 in^2

oK. But 1 is asking how the area was affected by the dilation.

@AriPotta

it can be : area = 16 times of the area of before do dilated

Oh,ok. Let me write that down .

or '16 times the original area'?

yes

20. AriPotta

4^2

Ok, thx

22. AriPotta

i told you that trick before, enchilada

I'm forgetful. SORRY. HAHHAHAHAHA

24. AriPotta

for area, you square the amount of times it changed. like, if the scale factor is 3, 3^2 = 9. so the area would be 9 times greater

Oh. okay.

26. AriPotta

if you're doing volume, you cube it

So the answer would be is 16 times larger than before?

28. AriPotta

yea, 16 times the original

Oh, I GET IT! I THINK. THANKS!

The perimeter is.

31. AriPotta

the perimeter would be 4 times greater

|dw:1360977934911:dw|

Is that a good drawing?

34. AriPotta

x is the scale factor. perimeter: x^1, area: x^2, volume: x^3

thanks. i get it, volume is cubed, area is squared. so the perimeter is .. um..

36. AriPotta

so since the scale factor is 4... 4^1 = 4. perimeter is 4x the original. is this making sense?