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# Geometry Vocabulary

### Vocabulary 6th grade

Term | Definition |
---|---|

Point | a geometric object that has no dimensions, only a location |

Plane | flat surface that extends in all directions endlessly; two dimentional |

Angle | two rays joined with a common endpoint; the two rays are called the sides of a angle |

Ray | part of a line that only has one endpoint |

Vertex | the common endpoint of a angle |

Line segment | part of a line that has two endpoints |

line | a set of points along a straight path having no endpoints |

Intersecting lines | lines that have just one point in common |

Skew Lines | lines that are not in the same plane and do not intersect |

Straight angle | angle that measures 180 degrees |

Zero angle | angle with a measure of 0 degrees |

right angle | angle that measures 90 degrees |

Acute angle | angle that measures less than 90 degrees |

obtuse angle | angle that measures more than 90 degrees and less than 180 degrees |

Reflex angle | angle that measures more than 180 degrees and less than 360 degrees |

Perigon (or revolution) | a angle that equals exactly 360 degrees |

congruent angles | angles that have the same measurement |

supplementary angles | two angles whose measures add up to 180 degrees; any 2 right angles are supplementary |

complementary angles | any 2 angles whose measures add up to 90 degrees |

transversal | a line that intersects two other angles |

adjacent angles | two angles that share a side or ray and a vertex |

vertical angles | a pair of opposite angles formed by intersecting lines |

corresponding angles | two lines intersected by transversal form corresponding pairs of angles; if the two lines are parallel the corresponding pairs of angles are congruent |

triangle | polygon with 3 sides, 3 angles, and 3 vertices |

equilateral triangle | all sides congruent |

isosceles triangle | AT LEAST 2 sides congruent |

scalene triangle | no sides congruent |

Equiangular triangle | all angles congruent; regular triangle |

acute triangle | all angles are acute |

right triangle | one right angle |

obtuse triangle | one obtuse angle |