HELP MEDAL & FAN LAST Q OF TONIGHT!

- FLVSKidd

HELP MEDAL & FAN LAST Q OF TONIGHT!

- jamiebookeater

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- FLVSKidd

##### 1 Attachment

- anonymous

Ok what is the difference between the centers?

- adamaero

http://www.mathwarehouse.com/geometry/circle/images/equation-of-circle/general-formula-equation-of-circle.png

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## More answers

- FLVSKidd

Would it be 113? @ adamaero

- adamaero

How did you get that answer?

- FLVSKidd

-3-4^2 + 1-9^2

- FLVSKidd

I remember seeing that formula you showed me.

- adamaero

You need two equations (for each circle).

- adamaero

There may be a more straightforward way, but I haven't thought of it.

- FLVSKidd

Can you give me an idea of what I need to do?

- adamaero

I'll foil it out, but I'm not sure that I'm guiding you down the right path anyway...

- anonymous

I took the test, how I did it was by translation. Remember, these are word problems and math problems.
What is the translation difference between the two?

- FLVSKidd

do you have the answers? or was that way back

- FLVSKidd

is there a formula for translation difference?

- FLVSKidd

- anonymous

It was my semester exam too, I had to get an extension.
No just plain translation, graph it.
How far would it be across the board? In units, aka "I translated A up 4 units and across by 2"

- FLVSKidd

Yeah I had to get an extension as well and I have 20 minutes to finish these questions.

- FLVSKidd

less than

- FLVSKidd

so I have to figure out how many units across the y and x it translated?

- anonymous

Ok mine was translated to the left and upwards. Explain the difference.
Then what is the difference in dilation? Explain that difference.

- FLVSKidd

what is dilation?

- anonymous

Expansion of an object. Primarily circles.

- anonymous

So what the explanation needs to be is something along the lines of "I proved they were similar by translating _________ and I dilated it ______"
Make sense?

- FLVSKidd

not really I get what you mean by dilation but doesnt similar mean the same angles?

- anonymous

Yes, its just larger.
A radius of 4 can be dilated to 1/4 aka 1.
So what you need to do is find the difference in location of the center point.

- FLVSKidd

from circle c to circle e right?

- anonymous

What is the difference in units of (-3, 1) and (4, 9)? Go X axis first, then Y axis.
Then what is the dilation difference?
And yes, either way it works.

- FLVSKidd

7 and 8 right?

- FLVSKidd

or is it -7 and 8

- anonymous

Yes, explain it by saying something like "I translated it to the right by 7 on the x-coordinate, moving it from -3 to 4"
For example of what you did.

- FLVSKidd

and upwards 8 right?

- anonymous

Yes.
Its to the right by 7 then upwards by 8 I think. Word it out.
Then the dilation is 4, what is 3/4 of four?

- FLVSKidd

3?

- FLVSKidd

.75

- anonymous

Yes. That is your answer. Word it out.

- FLVSKidd

3 or .75

- FLVSKidd

- anonymous

Something like "I proved they were similar by moving Circle C to the right by 7, moving -3 to 4. I then moved it upwards by 8...(fill in similar to first half here).. The dilation difference is 3/4.

- anonymous

Its 3 not .75

- FLVSKidd

okay

- anonymous

I said it by saying one can be translated to the other then dilated.

- FLVSKidd

thanks so much dude

- anonymous

Your welcome. Stay frosty.

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