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A 4-sided polygon is a quadrilateral


Polygon is a simple closed figure made of line segments


A quadrilateral has

  • 4 vertices − A, B, C, D
  • 4 sides − AB, BC, CD, DA
  • 4 angles − ∠A, ∠B, ∠C, ∠D

Opposite sides

  • AB & CD are opposite sides
  • AD & BC are opposite sides

Adjacent sides

  • AB, BC are adjacent sides
  • AB, AD are adjacent sides
  • BC, CD are adjacent sides
  • CD, DA are adjacent sides"
    Quadrilaterals - Part 2

Opposite angles

  • ∠A, ∠C are opposite angles
  • ∠B, ∠D are opposite angles


Quadrilaterals - Part 3


Adjacent angles

  • ∠A, ∠B are adjacent angles.
  • ∠A, ∠D are adjacent angles.
  • ∠B, ∠C are adjacent angles.
  • ∠C, ∠D are adjacent angles.


Diagonals of a quadrilateral

Quadrilaterals - Part 4

Line joining two opposite vertices of a quadrilateral is a diagonal.


Here, AC, BD are diagonals of the quadrilateral.

And they meet at point O.

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