1 General Mental and Psychological Abilities · 1.4.2 Geometry and trigonometry

1.4.2.4 Quadrilaterals and polygons: angle sums, diagonals and properties

Polygon questions come from two formulas (interior sum (n − 2) × 180°, exterior sum 360°) and the diagonal count n(n − 3)/2; quadrilateral questions come from a short table of which sides, angles and diagonals are equal, parallel or perpendicular.

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

Key terms

  • quadrilateral
  • parallelogram
  • rectangle
  • rhombus
  • square
  • trapezium
  • kite
  • interior angle sum
  • exterior angle
  • regular polygon
  • number of diagonals
  • triangles from vertices
  • Varignon

What this note covers

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

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