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# Geometry Dictionary

### 6th grade geometry terms and image

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

A figure formed by two rays or line segments with a common endpoint. The rays or line segmanets are called "sides." | Angle |

The common endpoint in an angle | Vertex |

Has a measure greater than 0 and less than 90 | Acute Angle |

Has a measure of 90 | Right Angle |

Has a measure of 180 | Straight Angle |

Has a measure greater than 180 but less than 360 | Reflex Angle |

Has a measure greater than 90 but less than 180 | obtuse Angle |

Two angles whose measures total 90 | Complementary Angles |

Opposite angles that are equal in measure. When two lines intersect, the angles that do not share a common side | Vertical Angles |

A line that crosses two or more lines. | Transversal |

Two angles whose measures total 180 | Supplementary Angles |

Angles that are next to each other. Adjacent angles have a common vertex and share a common side. | Adjacent Angles |

Having the dame size and shape | Congruent |

Having the same relative position in similar or congruent figures | Corresponding Angles or Sides |

The angles of a 2 dimensional or 3 dimensional figure | Interior Angles |

The outside angles of a 2 dimensional or 3 dimensional figure | Exterior Angles |

Something done to a figure that produces a new figure (translation, reflection, or rotation) | Transformation |

The ORIGINAL geometric figure that is changes (by a reflection, rotation, or translation) to produce another figure. | Pre-Image |

A NEW figure that is produced by a transformation of another image | Image |

"Turning" a figure around a fixed point | Rotation |

The "flipping" of a figure over a line. | Reflection |

"Sliding" a figure a certain distance | Translation |

Two lines that never meet, no matter how far they are extended | Parallel Lines |

Two Lines that cross or meet at a right angle | Perpendicular Lines |

A line that divides a segment, angle, or figure into two equal parts. | Bisector |

A point halfway between two points | Midpoint |

Created by:
stephanielynnej