# What is a perpendicular bisector?

## Definition #1 of Perpendicular Bisector:

A line that cuts a line segment into two equal parts at a right angle (90 )

We also have another definition of a perpendicular bisector that will be important to the work we do this year. Use the activity below to explore the second definition.

## Which points appear to be the same distance away from both A and B?

What do you notice about those points?
Is this always true?

## Definition #2 of Perpendicular Bisector:

An infinite set of points that is equidistant from two discreet points.

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