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# Chapter 18

### Plane Figures

vocabulary | definitions |
---|---|

Right Angle | An angle that measures 90° |

Acute Angle | An angle that measures greater than 0° and less than 90° |

Obtuse Angle | An angle that measures more than 90° and less than 180° |

Polygon | A closed plane figure with straight sides |

Triangle | A polygon with 3 sides |

Quadrilateral | A polygon with 4 sides |

Pentagon | A polygon with 5 sides |

Hexagon | A polygon with 6 sides |

Octagon | A polygon with 8 sides |

Regular Polygon | A polygon in which all sides are equal length and angles have equal measure |

Equilateral Triangle | A triangle with 3 equal sides |

Isosceles Triangle | A triangle with 2 equal sides |

Scalene Triangle | A triangle with no equal side |

Trapezoid | A quadrilateral with exactly one pair of parallel sides |

Venn Diagram | A diagram that shows relationships among sets of things |

Circle | A closed plane figure made of points that are same distance from the center |

Center | The point inside the circle that is the same distance from each point of the circle |

Chord | A line segment that has its endpoints on the circle |

Diameter | A chord that passes through the center of the circle |

Radius | A line segment with one endpoint at the center of the circle and the other endpoint on the circle |

Compass | A tool used to construct circles |

Created by:
Central 4th Math