Locus

Locus of Points Equidistant from a Given Object(s)

    1)    r units away from a point---a circle with radius r and whose center is the point
    2)    two points (segment)----a perpendicular bisector of the segment formed by the two points
    3)    three points---one point
    4)    n units from one line----two parallel lines n units from the original line
    5)    two parallel lines---one parallel line between the two parallel lines
    6)    an angle----the angle bisector
    7)    two intersecting lines---4 angle bisectors or two intersecting lines
    8)    a line and a point off that line---a parabola

Intersection of loci--How many points two or more loci have in common
    1)    First, draw the given
    2)    Sketch the first loci
    3)    Next, sketch the second loci
    4)    Count points in common to both. (All points of intersection if any)