Ahh I thought I’d posted the answer to my last post the day after, and now I see I didn’t. Whoops
In my last post I described a question where I couldn’t see the answer.
When I took the question away and studied it, I realised I hadn’t read the question in full and it wasn’t my small doubts on Circle Theorems that were the issue.
However good you get at Maths there will always be some thinks you spot quicker than others – but in all cases, reading the quesion is so important!
The line I have underlined tells me that < CBA is x degrees – I was trying to think of another Circle Theorem that told me that! The alternate angle theorem tells us that <BAC is x degrees. Once we know the opposite angles are the same, so are the sides, so AC = BC