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# Geometry

### Unit 2

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

Adjacent angles | Angles in the same plane that have a common vertex and a common side, but no common interior points. |

Alternate exterior angles | Alternate exterior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are outside the other two lines. |

Alternate interior angles | Alternate interior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are i between the other two lines. |

Centroid | The point of concurrency of the medians of a triangle. |

Circumcenter | The point of concurrency of the perpendicular bisectors of the sides of a triangle. |

Coincidental | Two equivalent linear equations overlap when graphed. |

Complementary angles | two angles whose sum is 90 degrees |

Congruent figures | figures that have the same size and shape. |

Dilation | Transformation that changes the size of a figure, but not the shape. |

Equiangular | The property of a polygon whose angles are all congruent. |

Equilateral | The property of a polygon whose sides are all congruent. |

Exterior angle of a polygon | An angle that forms a linear pair with one of the angles of the polygon |

Incenter | The point of concurrency of the bisectors of the angles of a triangle. |

Intersecting Lines | Two lines in a plane that cross each other. Unless two lines are coincidental, parallel, or skew, they will intersect at one point. |

Intersection | The point at which two or more lines intersect or cross. |

Inscribed polygon | A polygon is inscribed in a circle if and only if each of its vertices lie on the circle. |

Linear pair | Adjacent, supplementary angles. Excluding their common side, a linear pair forms a straight line. |

Median of a triangle | A segment is a median of a triangle if and only if its endpoints are a vertex of the triangle and the midpoint of the side opposite the vertex. |

Midsegment | A line segment whose endpoints are the endpoint of two sides of a triangle is called a midsegment of a triangle. |

Orthocenter | The point of concurrency of the altitudes of a triangle. |

Plane | One of the basic undefined terms of geometry. Traditionally thought of as going on forever in all directions (in two-dimensions) and is flat (i.e., it has no thickness). |

Proportion | An equation which states that two ratios are equal. |

Ratio | Comparison of two quantities by division and may be written as r/s, r:s, or r to s. |

Regular polygon | A polygon that is both equilateral and equiangular. |

Remote interior angles of a triangle | the two angles non-adjacent to the exterior angle |

Same-side interior angles | Pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on the same side of the transversal and are between the other 2 lines. When the two other lines are parallel, same-side interior angles are supplementary. |

Same-side exterior angles | Pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on the same side of the transversal and are outside the other 2 lines. When the two other lines are parallel, same-side interior angles are supplementary. |

Scale factor | The ratio of any two corresponding lengths of the sides of two similar figures. |

Similar figures | Figures that have the same shape but not necessarily the same size. |

Skew lines | Two lines that do not lie in the same plane ( therefore, they cannot be parallel or intersect. |

Supplementary angles | Two angles whose sum is 180 degrees. |

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

Vertical angles | Two nonadjacent angles formed by intersecting lines or segments (also called opposite angles). |

Created by:
eric.brock