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  1. Perpendicular Symbol (⊥)

  2. Parallel and Perpendicular Lines – Definition With Examples

  3. Parallel and Perpendicular Lines - Definition, Properties

  4. The "Up Tack (⊥)" Symbol in Mathematics

  5. Lines: Intersecting, Perpendicular, Parallel - CliffsNotes

  6. Perpendicular Lines – Definition, Symbol, Properties, Examples

  7. Parallel and Perpendicular Lines - Math is Fun

  8. Perpendicular and Parallel - Math is Fun

  9. Parallel and Perpendicular Definitions - MathBitsNotebook(Geo

  10. Perpendicular lines - Math.net

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