#### Answer

The locus is the interior of a sphere of radius 3 units that is centered on the given point.

#### Work Step by Step

While this figure is fairly hard to draw, it is not too difficult to describe. Recall, a locus to the point is the same distance away from the plane at all points. Thus, there are infinite spheres of radius under 3 cm that are centered on the point that are solutions to this problem. Combining all of these points, we find that the locus is the interior of a sphere of radius 3 units that is centered on the given point.