Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

# Fennville Geo Unit 1

### review of key ideas for unit 1 geometry

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

point | names a location. represented by a dot. |

line | straight path through two or more points that extends forever. |

segment | part of a line consisting of two endpoints and all points between them. |

ray | part of a line that starts at an endpoint and extends forever in one direction. |

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

acute angle | angle that measures greater than zero and less than 90 degrees |

right angle | angle that measures exactly 90 degrees |

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

straight angle | angle formed by two opposite rays and measures exactly 180 degrees |

angle bisector | a ray that divides an angle into two congruent angles. a ray that splits an angle in half. |

bisect | to cut in half |

collinear points | points that lie on the same line |

non-collinear points | three or more points that do not lie on the same line |

coplanar | points that lie on the same plane |

congruent angles | angles which have the same measure |

complementary angles | two angles that add to 90 degrees |

supplementary angles | two angles that add to 180 degrees |

distance | absolute value of the difference of the coordinates of two points on a number line |

linear pair of angles | two adjacent angles that form a straight angle or line. |

adjacent angles | two angles with the same vertex that share a side but do not share any interior points. |

non-adjacent angles | two angles that are not adjacent. |

plane | flat surface that has no thickness and extends forever; formed by three non-collinear points |

vertical angles | two non-adjacent angles formed by two intersecting lines. |

midpoint of a segment | point exactly in the middle of a segment. |

reflection | transformation across a line (flip) which produces congruent figures with opposite orientations |

rotation | transformation about a point (turn) which produces congruent figures with the same orientation |

translation | transformation in which all points move the same distance in the same direction (slide) which produces congruent figures with the same orientation |

transformation | a change in the position, size, or shape of a figure. |

opposite rays | two rays that have a common endpoint and form a line. |

AC | by the segment addition postulate, when point B is between points A and C on segment AB, AB + BC = |

ABD | by the angle addition postulate, measure of angle ABC + measure of angle CBD = measure of angle |

Created by:
Gutierrez-Fennville