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单选题
A circle with center A has its center at (6, -2) and a radius of 4. Which of the following is the equation of a line tangent to the circle with center A ?
A
y＝3x+2
B
y＝2x+1
C
y＝-x+5
D
y＝-2
E
y＝-6
参考答案
参考解析
解析：
切线指与圆相交且与圆只有一个焦点的线。A、B与圆不相交。C、D 与圆相交且有两个交点。只有E项符合。
切线指与圆相交且与圆只有一个焦点的线。A、B与圆不相交。C、D 与圆相交且有两个交点。只有E项符合。
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