In the diagram, P1P2 and Q1Q2are the perpendicular bisectors of AB¯¯¯¯¯ and BC¯¯¯¯¯, respectively. A1A2 and B1B2 are the angle bisectors of ∠A and ∠B, respectively. What is the center of the circumscribed circle of ΔABC?

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In the diagram P1P2 and Q1Q2are the perpendicular bisectors of AB and BC respectively A1A2 and B1B2 are the angle bisectors of A and B respectively What is the class=