<PRE><B>Question 268315</B>
describe each locus of point 
1. in space, the locus of points equdistant from two parallel planes
Ans: A plane midway between the given planes.
------------------------------------------------------
2. in a plane, the locus of points 4 cm from the center of a circle whose radius is 5cm
Ans: A cicle with center at the center of the given circle, with radius of 4 cm.
------------------------------------------------------
3. in a plane, the locus of the centers of all circles with the radius 3 cm that are tangent to a given line L.
Ans: Two lines parallel to the tangent line and 3 cm from it.
================================================================
Cheers,
Stan H.
</PRE>