LunarSF

Sorry ... I didn't realize.

Thanks for explaining. It really helped.  

Thank you for your help anyways, can you judge if this is correct? -

I did some calculations and got CD, not sure if I'm right, may someone please check this answer? I just compared all the lengths to AD after figuring out it's side length, is this the right way to go?

As for the third one I know ii is true but I'm not sure about i ... 

That does make sense ... but what if another angle in the triangle makes the opposite line tilt in such a way that it is no longer that short? Can you explain a little bit more? I'm still kind of confused ... 

Also I'm a new user, so please tell me if these images work or not ... many thanks!