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# Unit 1-1 to 1-4

### Pearson Geometry Unit i

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

Collinear points | points that lie on the same line. |

Coplanar | points and lines lie in the same plane. |

Intersection | the set of points the figures have in common. |

Line | a straight path that extends in two opposite directions without end and has no thickness; contains infinitely many points. |

Opposite rays | two rays that share the same endpoint and form a line. |

Plane | represented by a flat surface that extends without end and has no thickness; contains infinitely many lines. |

Point | indicates a location and has no size. |

Postulate | an accepted statement of fact. |

Ray | part of a line that consists of one endpoint and all points of the line on one side of the endpoint. |

Segment | part of a line that consists of two endpoints and all points between them. |

Congruent segments | Two segments that have the same length. |

Coordinate | the real number that corresponds to the location of a point. |

Distance | the absolute value of the difference of two point's coordinates. |

Midpoint | the point that divides a segment into two congruent segments. |

Segment bisector | a point, a line, a ray, or another segment that intersects a segment at its midpoint. |

Acute angle | an angle whose measure is between 0 and 90. |

Angle | formed by two rays with the same endpoint. |

Congruent angles | angles with the same measure. |

Obtuse angle | an angle whose measure is between 90 and 180. |

Right angle – A right angle is | an angle whose measure is 90. |

Straight angle | an angle whose measure is 180. |

Vertex of an angle | the common endpoint of the two rays that form the angle. |

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