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# Geometry Vocab

### Chapter 1

Question | Answer |
---|---|

two angles who share a common vertex and a side but have no common interior points | Adjacent Angles |

a ray that divides an angle into two angles that are congruent | Angle Bisector |

an angle that measures between 0 and 90 degrees | Acute Angle |

an angle that measures between 90 and 180 degrees | Obtuse Angle |

an angle that measures 90 degrees | Right Angle |

an angle that measures 180 degrees | Straight Angle |

points that lie on the same line | Collinear |

tool used to draw angles | Compass |

two angles whose sum of their measures equals 90 degrees | Complementary/Complement |

no line that contains a side of the polygon contains a point in the interior of the polygon | Convex |

points that lie on the same plane | Coplanar |

all sides are congruent | Equilateral |

not convex | Concave |

all angles are congruent | Equiangular |

Is equilateral and equiangular | Regular |

part of a line with two endpoints and all the points in between | Line segment |

part of a line with one endpoint and all the points on one side of the endpoint | ray |

two collinear rays with the same endpoint that form a line | opposite rays |

endpoints | |

two adjacent angles that have their noncommon sides form a line | Linear Pair |

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

statements we accept to be true | Postulate |

tool used to measure the degree of angles | Protractor |

a point, ray, line, line segment, or plane that intersects the segment at its midpoint | Segment Bisector |

two angles whose sum of their measures is 180 degrees | Supplementary/Supplement |

statements we prove to be true | Theorm |

has no dimensions (size) | Point |

series of points without end | Line |

flat surface that extends in all directions in two dimensions without end | Plane |

initial point | Vertex |

two angles that sides form two pairs of opposite rays | Vertical Angles |

Distance Formula | |

Midpoint Formula | |

Congruent vs. Equal | |

if two segments have the same length | *congruent |

two rays with a common endpoint | *angles |

a closed figure that lies in a plane formed by three or more line segments | *polygon |

the distance between A and B is the absolute value of the difference between the coordinates A and B | *ruler postulate |

if B is between A and C then AB+BC=AC (sum of the parts is equal to the whole) | *segment addition postulate |

if P is the interior of angle RST then measure of angle RSP plus the measure of angle PST will equal the measure of angle RST (sum of parts is equal to whole) | *angle addition postulate |

Created by:
12tsherman