Perpendicular Bisector Definition

Interact with the applet below for a couple of minutes. [br][br]As you do, be sure to move the [b]endpoints (BIG WHITE POINTS)[/b] of the [b][color=#444444]gray segment[/color][/b] around. [br][br]After doing so, please answer the question that follows.
1.
What does it mean for a line to be a [b][color=#cc0000]perpendicular bisector[/color][/b] of a [color=#666666][b]segment[/b][/color]? Explain.
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Information: Perpendicular Bisector Definition