1 . 在直角坐标系xoy中,直线l的参数方程为
为参数
,以原点O为极点,x轴正半轴为极轴建立极坐标系,圆C的极坐标方程为
.
(1)若
,求圆C的直角坐标方程与直线l的普通方程;
(2)设直线l截圆C的弦长等于圆C的半径长的
倍,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34cb8b27dd217b0b3df1cefd779aae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb989ab123acd2b26f7734444a3715d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d355cfa109104861ab22387fb9bd278.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9af6b8933cb0bcc983a15c903b5892e.png)
(2)设直线l截圆C的弦长等于圆C的半径长的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
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2019-02-21更新
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2卷引用:【市级联考】陕西省渭南市 2019届高三数学质量检测1文科数学试题