If o is the circumcenter of triangle abc

- If o is the circumcenter of triangle abc and od is perpendicular to bc
- If o is the circumcenter of triangle abc then angle obc angle bac
- If o is the circumcenter of a triangle abc then prove that obc bac 90
- In the figure o is the centre of the circle
- Inscribed and circumscribed circles of a triangle
- How to find the orthocenter of a triangle with coordinates