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1．二次函数、三角形及四边形的综合

(1)填空：抛物线的顶点坐标是(_______，_______)，对称轴

(2)已知 y 轴上一点 A(0,2)，点 P 在抛物线上，过点 P 作 PB

⊥x 轴，垂足为点 B 若.PAB 是等边三角形，求点 P 的坐标；

(3)在(2)的条件下，点 M 在直线 AP 上．在平

D88

2．圆与三角形的综合

(1)

(2)

(3)

(2)解：如图 D90，当 PC 是⊙O 的直径时，△PCD≌△ABC.

∴∠PBC＝∠ACB＝90°，AB＝PC.

∵∠A＝∠P，

∴△PCD≌△ABC.

3．函数与圆的综合

①当 0≤b≤4 时，直线 l 扫过矩形 ABCD 的面积 S 为 0.

D91

D93