The collection of all the points in a plane, which are at a fixed distance from a fixed point in the plane, is a/an

The collection of all the points in a plane, which are at a fixed dist

1.	The collection of all the points in a plane, which are at a fixed distance from a fixed point in the plane, is a/an
Answer» The collection of all the points in a plane, which are at a fixed distance from a fixed point in the plane, is a/an