In this video, we are going to look at locus and various examples of locus.

Locus: A point or set of points that satisfy a given condition.

Circle:
Given point $A$, if we were to find all points located 3 units from point $A$, we would have to measure 3 units with the center at point $A$. In fact, the locus would be one circle with a radius of 3 units with the center at point $A$.

Two Parallel Lines:
Given a line $l$, if we were to find all points $d$ units from line $l$, we would have to measure $d$ units from line $l$. In fact, the locus would be two parallel lines $d$ units above and below line $l$.

Line Equidistant from Two Parallel Lines:
Given two parallel lines, if we were to find all points equidistant from the two parallel lines, we would have to find points located exactly in the middle of the two lines. In fact, the locus would be one parallel line directly in between the two other lines.

Two Intersecting Lines:
Given two intersecting lines, if we were to find all points equidistant from them, we would have to find points that fall on a line that bisect the two intersecting lines. In fact, the locus would be two lines that bisect the original two intersecting lines.

Point Equidistant From Two Points:
Given points $A$ and $B$, if we were to find all points equidistant from them, we would have to find points that are exactly in the middle of the two points. In fact, the locus would be the perpendicular bisector of the line segment drawn from point $A$ to point $B$.