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Perimeter

Explore Perimeter on MathWorld


The perimeter is a length around the boundary of a closed two-dimensional region. The perimeter of a circle is called its circumference.

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


Classroom Articles on Plane Geometry

  • Acute Angle
  • Hypotenuse
  • Altitude
  • Midpoint
  • Angle
  • Obtuse Angle
  • Area
  • Parallel
  • Circle
  • Perpendicular
  • Circumference
  • Pi
  • Collinear
  • Plane Geometry
  • Complementary Angles
  • Point
  • Diameter
  • Radius
  • Geometric Construction
  • Supplementary Angles
  • Golden Ratio
  • Triangle Inequality
  • Golden Rectangle

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

  • Cone
  • Pentagon
  • Cube
  • Polygon
  • Cylinder
  • Prism
  • Decagon
  • Pyramid
  • Dodecagon
  • Quadrilateral
  • Equilateral Triangle
  • Rectangle
  • Hendecagon
  • Regular Polygon
  • Heptagon
  • Right Triangle
  • Hexagon
  • Sphere
  • Isosceles Triangle
  • Square
  • Nonagon
  • Surface Area
  • Octagon
  • Triangle
  • Parallelogram
  • Volume