(1)? |AB|= 1。 ? (II) When d is the minimum value, the minimum value is.

The general equation used in the first question is.

The intersection of simultaneous equations and is A( 1, 0),

Then |AB|= 1.

The parameter equation of the second question is (parameter), so the coordinate of point P is,

So the distance from point P to line L is

Through trigonometric functions.

Solution. The general equation of (i) is.

The intersection of simultaneous equations and is A( 1, 0),

Then | AB | = 1. -Five points.

The parameter equation of (II) is (parameter), so the coordinate of point P is,

So the distance from point P to line L is

,

Therefore, at this time, d takes the minimum value, and the minimum value is ...-10.