Circle Theorems

   
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It seems that there is a collection of "Circle Theorems" that get taught in schools maths. These are:

That makes seven "Theorems".

The first and second follow from symmetry. The third is quite tricky to find a proof of, and could give a real "Aha!" moment. The fourth is a simple deduction from the third, and is known as "Thale sTheorem".

I wrote a blog entry about that.

The remaining three I need to think some more about - I'm not even sure what 5 and 7 mean.

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