A 4-sided polygon is a quadrilateral

Polygon

Polygon is a simple closed figure made of line segments

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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"
    22.jpg

Opposite angles

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

 

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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

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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.

  1. Chapter 5 Class 6 Understanding Elementary Shapes
  2. Concept wise
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.