在极坐标系中,已知圆的圆心,半径. (1)求圆的极坐标方程; (2

在极坐标系中,已知圆的圆心,半径.

1)求圆的极坐标方程;

2)若,直线的参数方程为为参数),直线交圆两点,求弦长的取值范围.

答案

解:(Ⅰ)的直角坐标为,∴圆的直角坐标方程为.

化为极坐标方程是 (Ⅱ)将代入圆的直角坐标方程

,即

.

即弦长的取值范围是.

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