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=](https://us-static.z-dn.net/files/dda/8bfd163c6e918a018e4aed067671b022.png)