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# Unit 1 Exam Geometry

### Geometry

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

Right Angle | An angle that measures 90º. |

Acute Angle | Any angle that measures less that 90º. |

Obtuse Angle | Any angle that measures more than 90º. |

Complementary Angles | Any 2 angles that measure 90º when added up together. |

Supplementary Angles | Any 2 angles that measure 180º when added up together. |

Vertical Angles | Any set of lines that have equal sides |

Linear Pair of Angles | A set of angles that form 90º angles and are adjacent to each other. |

Parallel Lines | 2 lines that do not intersect each other. |

Perpendicular Lines | 2 lines that intersect and form a 90º angle. |

Triangle | 3 sides. |

Quadrilateral | 4 sides. |

Pentagon | 5 sides. |

Hexagon | 6 sides. |

Septagon (Heptagon) | 7 sides. |

Octagon | 8 sides. |

Nonagon | 9 sides. |

Decagon | 10 sides. |

Unecagon | 11 sides. |

Dodecagon | 12 sides |

n-gon | n sides. |

Concave Polygon | Lines fall outside of the shape. |

Convex Polygon | Lines fall inside the shape. |

Polygon | A closed shape with flat and connecting sides with more that 3 sides. |

Diagonal | A line that goes from 1 vertex to another non-consecutive vertex. |

Equilateral Polygon | A polygon in which all the sides are congruent. |

Equiangular Polygon | A polygon in which every angle is congruent. |

Regular Polygon | A polygon in which every angle and side is congruent. |

Trapezoid | A quadrilateral that has 2 parallel sides (or exactly 1 set of parallel sides). |

Kite | A quadrilateral in which the adjacent sides are congruent. |

Parallelogram | A quadrilateral that has 2 sets of parallel sides. |

Rhombus | A quadrilateral in which both sets of sides are parallel and congruent. |

Rectangle | A quadrilateral in which every angle is 90º and there are 2 sets of parallel lines that are congruent. |

Square | A quadrilateral in which all of the sides are congruent |

Chord | A line segment that extends from 1 point of the circle to another point. |

Diameter | It is a line segment that passes through the center and extends to the other side. (It is the longest line segment |

Radius | It is a line segment that extends from 1 point of the circle to the center. |

Tangent | It is a line that intersect a curve or circle at only 1 point. |

Congruent Circles | Circles that have the same radius length. |

Concentric Circles | Circles that share the same center. |

Semi Circle | It is half of a circle |

Minor Arc | It always measures less than 180º. |

Major Arc | It always measures more than 180º. |