or the difference between their radii. Two circles will intersect at two points when \({r_1} - {r_2}\textless d\textless{r_1} + {r_2}\) The centre of one circle will lie on the other circle when ...

Circle theorems are properties that are true for all circles, regardless of their size. There are six theorems to learn and recognise. Questions can have a combination of theorems. It is important ...