Please check my answer
Triangle ABC has been dilated to form triangle AꞌBꞌCꞌ.What is the scale factor?

- anonymous

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- anonymous

i think it is 2/5 once simplified

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- anonymous

@igreen

- anonymous

@radar

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- anonymous

@Kainui

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@TheSmartOne

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@ganeshie8

- ganeshie8

simply take the ratio of sides of image and preimage :
\[\large \dfrac{7.5}{3}\]

- anonymous

yes , I did and simplified I got 2/5

- anonymous

I did the 7.5/3...3/7.5...becomes 2/5

- ganeshie8

you did it in reverse

- ganeshie8

7.5/3 should be 5/2

- ganeshie8

\[\large \dfrac{7.5}{3} = \dfrac{75}{30} = \dfrac{5}{2}\]

- anonymous

I did it like this one...
Pre-image ABCD was dilated to produce image AꞌBꞌCꞌDꞌ.
What is the scale factor of the similar figures? Enter the answer in simplest form.
Two quadrilaterals labeled A B C D and A-prime, B-prime, C-prime, D-prime. Quadrilateral A B C D is larger than the other quadrilateral, which is to the right of quadrilateral A B C D. Side B C is labeled twelve, and side B-prime, C-prime is labeled nine.

- anonymous

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- anonymous

it was explained to me that I needed to reverse the numerator and the denominator ....
now confused :{

- ganeshie8

just a convention
always put the "image" side on top

- anonymous

ok... so i need to go back and fix the other as well then or it will be incorrect?.

- ganeshie8

whats your answer for the other one with quadrilateral ?

- anonymous

simplified 3/4.... but that was doing the switching thing bc I originally had 4/3

- ganeshie8

3/4 is correct.

- anonymous

ok, but what is the reason I flip the one and not the other? I just want to make sure I understand it

- ganeshie8

no wait, in the first question, the bigger triangle is image, yes ?

- anonymous

let me reread it

- anonymous

it reads as if the ABC is the original and the other is the dilation

- anonymous

if it is image on top the the first would be 12/9 simplified to 4/3

- ganeshie8

|dw:1433344043799:dw|

- anonymous

kk

- ganeshie8

Image = final picture after dilation
preimage = original picture before dilation

- anonymous

and the image or original is the numerator the copy the denominator right?

- ganeshie8

again, image is final picture after dilation

- ganeshie8

preimage is original picture before dilation

- anonymous

no I said it wrong meant to say it the other way... now I am confusing myself...lol

- ganeshie8

for first question 5/2 is correct
for second question 3/4 is correct

- anonymous

Just seems as if it should be the other way around :) I got it now. I just need to pay close attention to which one is the original and which is the copy. I think if I look at it that way vs. image/pre-image I get it a bit better.

- ganeshie8

actually scaale factor = pre-image/image makes more sense

- ganeshie8

because you can get the dimensions of image by simply multiplying the original dimensions by scale factor

- anonymous

and always put the original on top and copy on bottom right?

- ganeshie8

always put image on top
original on bottom

- ganeshie8

you just need to do couple of problems before seeing why it makes sense

- anonymous

ok,ok, I got this now :) Thank you. sometimes it is the smallest of things that trip me up but it just takes putting it in to a way my brain accepts the info without twisting it...yay for dyslexia...again thank you :)

- ganeshie8

this trips everyone in the start, things will make sense by practice eventually

- anonymous

tyvvm!

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