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# Angle Relationships

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### Angle Relationships

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