Difference between revisions of "Perimeter"

(Formulas)
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* [[Square (geometry) | Square]]: <math>4s</math>, where <math>s</math> is the side length. <follows from rectangle>
 
* [[Square (geometry) | Square]]: <math>4s</math>, where <math>s</math> is the side length. <follows from rectangle>
  
* [[Circle]] - <math>2\pi r</math>, where <math>r</math> is the [[radius]].
+
* Circle - <math>2\pi r</math>, where <math>r</math> is the [[radius]].
  
 
* [[Regular polygon]] with <math>n</math> sides: <math>ns</math>, where <math>s</math> is the side length.
 
* [[Regular polygon]] with <math>n</math> sides: <math>ns</math>, where <math>s</math> is the side length.

Revision as of 10:25, 6 November 2007

Definition

The perimeter of a geometric figure is the distance around the outside of the figure. Perimeter is often denoted by P. The perimeter of a circle is called its circumference.

Formulas

  • Rectangle: $2(l+w)$, where $l$ is the length and $w$ is the width.
  • Square: $4s$, where $s$ is the side length. <follows from rectangle>
  • Circle - $2\pi r$, where $r$ is the radius.
  • Polygon with $q$ sides: $\sum_{z=1}^{q} a_z$, where $a_i$ are the lengths of the sides of the polygon.

Introductory Example Problems