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Classifying Polygons by the Number of Sides

Polygons are closed shapes or figures in a plane with three or more sides.

Polygons are classified by how many sides they have.

Following lists the different types of polygons and the number of sides that they have:

  • A triangle is a three?sided polygon.
  • A quadrilateral is a four?sided polygon.
  • A pentagon is a five?sided polygon.
  • A hexagon is a six?sided polygon.
  • A heptagon is a seven?sided polygon.
  • An octagon is an eight?sided polygon.
  • A nonagon is a nine?sided polygon.
  • A decagon is a ten?sided polygon.
Summary
  • Polygons are closed shapes or figures in a plane with three or more sides.
  • Polygons are classified by how many sides they have.
  • Some common polygons are shown in the table given below:

    1. Triangle
    3 sides

    2. Quadrilateral
    4 sides

    3. Pentagon
    5 sides

    4. Hexagon
    6 sides

    5. Heptagon
    7 sides

    6. Octagon
    8 sides

    7. Nonagon
    9 sides

    8. Decagon
    10 sides

More Lessons on Geometry

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