| 1. | The line through them ( operation 1 ) is the perpendicular bisector.
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| 2. | The perpendicular bisector construction can be reversed via isogonal conjugation.
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| 3. | Can you assume the median is a perpendicular bisector?
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| 4. | Construct the perpendicular bisector of the line segment.
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| 5. | In particular, this allows us to define the " perpendicular bisector " of any segment.
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| 6. | The perpendicular bisector construction forms a quadrilateral from the perpendicular bisectors of the sides of another quadrilateral.
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| 7. | Another chord,, is the perpendicular bisector of, and is consequently a diameter of the circle.
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| 8. | So the perpendicular bisector of D'D ( a segment of s ) is also perpendicular to r.
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| 9. | :: Consider where the 9 point center must lie between the altitude and perpendicular bisector from each side.
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| 10. | The centres of the horocycles are the ideal points of the perpendicular bisector of the line-segment between them.
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