题目

She is good at b__________and can always buy what she likes at a lower price than the seller offered. 答案：bargaining如图，将△AOB置于平面直角坐标系中，O为原点，∠ABO=60°，若△AOB的外接圆与y轴交于点（0，3）（1）求∠DAO的度数；（2）求点A的坐标和△AOB外接圆的面积．