# Math Help - Prove question

1. ## Prove question

The radius of circle ABC, centre B is r1.
The radius of circle CDE, centre D is r2.

For the diagram above PROVE that AC/CE = r1/r2

:l

2. ## Re: Prove question

This is a picture

3. ## Re: Prove question

Hint: There are some similar triangles in the diagram...

4. ## Re: Prove question

How about this pic attached. $\frac{\sqrt(2)*r1}{\sqrt(2)*r2} = \frac{r1}{r2}$

5. ## Re: Prove question

Jakncoke, I dont quite understand where and how you got those figures could you please explain?

6. ## Re: Prove question

@jakncoke, that's only a specific case (for right isosceles triangles). It does generalize, using similarity.

7. ## Re: Prove question

yea my bad, i wasn't thinking.