解答题-证明题 较难0.4 引用2 组卷254
如图,已知AB是⊙O的直径,P是BA延长线上一点,PC切⊙O于点C,CD⊥AB,垂足为D.
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215419858845696/2217159574331392/STEM/2fd2eb0ab99c48ebb6bcc0490a460e1c.png?resizew=185)
(1)求证:∠PCA=∠ABC;
(2)过点A作AE∥PC交⊙O于点E,交CD于点F,交BC于点M,若∠CAB=2∠B,CF=
,求阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215419858845696/2217159574331392/STEM/2fd2eb0ab99c48ebb6bcc0490a460e1c.png?resizew=185)
(1)求证:∠PCA=∠ABC;
(2)过点A作AE∥PC交⊙O于点E,交CD于点F,交BC于点M,若∠CAB=2∠B,CF=
2019·湖北襄阳·一模
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