(本題滿分15分) 圓C過(guò)點(diǎn)A(2,0)及點(diǎn)B(,),且與直線l:y=相切

(1)求圓C的方程;

(2)過(guò)點(diǎn)P(2,1)作圓C的切線,切點(diǎn)為M,N,求|MN|;

(3)點(diǎn)Q為圓C上第二象限內(nèi)一點(diǎn),且∠BOQ=,求Q點(diǎn)橫坐標(biāo).

 

【答案】

(1)     (2)      (3)

【解析】略

 

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