In the diagram, P1P2 and Q1Q2 are the perpendicular bisectors of line AB and BC , respectively. A1A2 and B1B2 are the angle bisectors of angle A and B , respectively. The center of the inscribed circle of ΔABC is point ____ , and the center of the circumscribed circle of ΔABC is point ____ .

In the diagram P1P2 and Q1Q2 are the perpendicular bisectors of line AB and BC respectively A1A2 and B1B2 are the angle bisectors of angle A and B respectively class=