*The locus is the set of all points that satisfy a given condition.
- A locus is a general graph of a given equation.
- one point:the locus of points equidistant from a single point is a set of points equidistant from the point in every direction.
-two points: (a line through the middle of the two points). the locus of points equidistant from 2 points is the perpendicular bisector of the line segment connecting the two points
- one line: (two parallel lines on opposite sides , equidistant and parallel to that line.
-Two parallel lines: (a line through the middle of the two line). The locus of points equidistant from 2 parallel line is another line, half way between both line and parallel to each of them .
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