## Online Course Discussion Forum

### still need help on p18 in winter camp geometry blue

still need help on p18 in winter camp geometry blue

Could I have more detailed hints on how to find the ratio of BC to CF? thanks

Re: still need help on p18 in winter camp geometry blue

Hi Iris. A good place to start is with the center of the circle. Then it can be helpful to connect this to all the relevant points and label everything. An example of how this could go is below:

There's still some work to do here. As some additional hints, try to show the following:

1. $\triangle OBD\sim\triangle BHD$
2. $HGCO$ is a cyclic quadrilateral
3. $\triangle BGH\cong\triangle CGE$
4. $\triangle CEF\sim\triangle EBF$

Hope this helps a little more!

Re: still need help on p18 in winter camp geometry blue

Thanks, professor. I am still not sure how you get #4 above. also, how to use the condition that CD is an angle bisector?

Re: still need help on p18 in winter camp geometry blue

I also don't know how to prove that HGCOHGCO is a cyclic quadrilateral

Re: still need help on p18 in winter camp geometry blue

I was not able to prove  triangle BGH is identical to triangle CGE either