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Angle Relationships
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Angle Relationships

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  • 1. GEOMETRY Angle Relationships
  • 2. (Vertically opposite angles are equal).
  • 3. A pair of corresponding angles . ADE = AGH (Corresponding angles on CE parallel to FH are equal).
  • 4. A pair of alternate angles . CDB = AGH (Alternate angles on CE parallel to FH are equal).
  • 5. A pair of cointerior angles . EDB + AGH = 180 (Cointerior angles on CE parallel to FH add to 180 ° ).
  • 6.
    • Tests for Parallel Lines
    • A pair of lines are parallel if:
    • Alternate angles are equal
    • Corresponding angles are equal
    • Cointerior angles add to 180 °