A [b]perpendicular bisector[/b] of a line segment is the line that [b]bisects[/b] the segment (cuts it in half) and is [b]perpendicular[/b] to it. This means it passes through the line segment's [b]midpoint at 90°[/b].[br][br]You can find the perpendicular bisector of [b]any[/b] of the three line segments that make up the sides of a triangle.