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Line AB | | Line CD

Parallel Lines : Corresponding Angles. E. A. B. Line AB | | Line CD Transversal Line EF crosses lines AB and CD at intersection points P and Q respectively. P. Q. C. F. D.  EPB and Angle  EFD are corresponding angles. Other pairs of corresponding angles are :

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Line AB | | Line CD

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  1. Parallel Lines : Corresponding Angles E A B Line AB| | Line CD Transversal Line EF crosses lines AB and CD at intersection points P and Q respectively. P Q C F D  EPB and Angle  EFDare corresponding angles. Other pairs of corresponding angles are :  FQD &  FPB,  APE &  CFE,  CQF &  APF Corresponding Angles formed by a transversal cutting two parallel lines are CONGRUENT!

  2. Parallel Lines : Interior Angles E A B Line AB| | Line CD Transversal Line EF crosses lines AB and CD at intersection points P and Q respectively. P Q C F D •  BPFand Angle  DQE are internal angles. • Other pair of internal angles is: • APF&  CQE • Internal Angles formed by a transversal cutting two parallel lines are SUPPLEMENTARY ANGLES of each other!

  3. Parallel Lines : Exterior Angles E A B Line AB| | Line CD Transversal Line EF crosses lines AB and CD at intersection points P and Q respectively. P Q C F D •  APE and Angle  CQF are Exterior angles. • Other pair of Exterior angles is: • EPB &  FQD • Exterior Angles formed by a transversal cutting two parallel lines are SUPPLEMENTARY ANGLES of each other!

  4. Parallel Lines : Alternate Angles E A B Line AB| | Line CD Transversal Line EF crosses lines AB and CD at intersection points P and Q respectively. P Q C F D •  APFand Angle  EFDare Alternate angles. • Other pair of Alternate angles is: • BPF&  CQE • Alternate Angles formed by a transversal cutting two parallel lines are CONGRUENT!

  5. Parallel Lines : Alternate Exterior Angles E A B Line AB| | Line CD Transversal Line EF crosses lines AB and CD at intersection points P and Q respectively. P Q C F D •  APE and Angle  FQD are External Alternate angles. • Other pair of External Alternate angles is: • EPB &  CQF • External Alternate Angles formed by a transversal cutting two parallel lines are CONGRUENT!

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