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Perimeter of a polygon is the sum of the measurements of its sides.

## Rectangle Perimeter

The perimeter of a rectangle is calculated as follows:

B - base or length Perimeter = 2b + 2h = 2 (b + h) |

## Perimeter of the regular polygons

Equilateral triangle | Square |

P = 1 + 1 + 1 P = 3 · l | P = 1 + 1 + 1 + 1 P = 4 · l |

Pentagon | Hexagon |

P = 1 + 1 + 1 + 1 + 1 P = 5 · l | P = 1 + 1 + 1 + 1 + 1 + 1 P = 6 · l |

**l ** - measurement of regular polygon side**P** - perimeter of regular polygon

For an n-sided polygon we have:

P = n · l Next: Length of the circumference