- the base is AC, - the other two sides are OA and OC with same length equal to OP (the radius of the circle) - when you trace the bisectriz of AC you realize it is a line perpedicular to AC that intersects the center of the the circle, O
To help you out I save your picture and explain the process. The only thing tht confuses me is problem #!6. But I hope I helped you out in the slightest bit