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Geometry 11 Online
OpenStudy (mynameisnemo):

How would I prove that two circles are similar? Would I use pi(r^2)? Would I dilate the circle or something?

OpenStudy (mynameisnemo):

This seems kinda simple and I'm sure I'm over thinking it, I know that all circles are similar but i'm required to put an answer. It's open answer.

OpenStudy (agent0smith):

Just find the scale factor for the radii: http://mathbitsnotebook.com/Geometry/Circles/CRProveSimilar.html

OpenStudy (mynameisnemo):

Oh wait one second, there's an image.

OpenStudy (mynameisnemo):

OpenStudy (mynameisnemo):

So, the radius for Circle E is 3 and the radius for circle C is 4.

OpenStudy (mynameisnemo):

so the scale factor is K=r^1/r^2?

OpenStudy (mynameisnemo):

sorry that looks like exponents, it should be k=r1/r2 right?

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