CBSE · Class 7 · Mathematics · Chapter 5

Parallel and Intersecting Lines

Explore angles and relationships formed when lines intersect or when a transversal crosses parallel lines.

6 lessons 45 min
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Lessons in this chapter

  1. 1Intersections, Angle Pairs, and Perpendicular LinesDiscover why intersecting lines form equal opposite angles and supplementary neighbouring angles.
  2. 2Recognising Parallel Lines and Folding PatternsRecognise, draw, mark and create parallel and perpendicular line families on paper.
  3. 3Transversals, Corresponding Angles, and Parallel ConstructionsUse matching angle positions to test parallelism and explain reliable constructions.
  4. 4Alternate Angles and Interior Angle ReasoningDerive new parallel-line relationships and use them in justified angle calculations.
  5. 5Multi-step Angle Problems and Parallel IllusionsSolve the full chapter’s diagram challenges and check appearances with geometric reasoning.
  6. 6Chapter Summary and PracticeConnect intersections, folds, constructions and angle reasoning in a complete chapter review.
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