Explore Polygon on MathWorld

A polygon is a two-dimensional figure that consists of a collection of line segments, joined at their ends.

Polygon is an elementary-school-level concept. It is listed in the California State Standards for Grade 3.


Parallelogram: A parallelogram is a quadrilateral with opposite sides parallel and therefore opposite angles equal.
Quadrilateral: A quadrilateral is a four-sided polygon.
Rectangle: A rectangle is a quadrilateral with opposite sides of equal length and with four right angles.
Regular Polygon: A regular polygon is a polygon in which the sides are all the same length and the angles all have the same measure.
Square: A square is a polygon with four sides of equal length and at right angles to each other.
Triangle: A triangle is a three-sided (and three-angled) polygon.

Classroom Articles on Polygons

  • Decagon
  • Isosceles Triangle
  • Dodecagon
  • Nonagon
  • Equilateral Triangle
  • Octagon
  • Hendecagon
  • Pentagon
  • Heptagon
  • Right Triangle
  • Hexagon
  • Trapezoid

  • Classroom Articles on Geometry (Up to Elementary-School Level)

  • Acute Angle
  • Parallel
  • Angle
  • Perimeter
  • Area
  • Perpendicular
  • Circle
  • Point
  • Cone
  • Prism
  • Cube
  • Pyramid
  • Cylinder
  • Radius
  • Diameter
  • Sphere
  • Geometric Construction
  • Surface Area
  • Obtuse Angle
  • Volume