1 General Mental and Psychological Abilities · 1.4.2 Geometry and trigonometry

1.4.2.1 Lines, angles and parallel lines

Angle questions run on three sums (90°, 180°, 360°) and three parallel-line rules (corresponding equal, alternate equal, co-interior add to 180°); set up one equation and solve.

  • APPSC Group 1
  • Advanced level
  • 6 min read
  • Full course

Key terms

  • angle types
  • complementary
  • supplementary
  • linear pair
  • vertically opposite angles
  • reflex angle
  • transversal
  • corresponding angles
  • alternate angles
  • co-interior angles
  • intersection of lines

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Common trapsFoundation
  5. Quick revisionFoundation

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