# Polygon

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.

### Examples

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. |