on another thread
In fact, if you draw the diagram carefully, you'll find that the line lies outside the quadrilateral - see the attached.
You'll then find that instead of , you get , which is quite a different matter!
hi thanks thats exactly what i got, but wasnt sure if it was just the case in the way I was drawing it, and maybe if the line can come inside for certain lengths
also, since it says that there is a mistake in the proof, can we assume that the mistake is not in the proof, but actually in the diagram, as an answer?
do u have any ideas on this question that i posted earlier:
I was clueless on the 2nd bit..