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# Geometry

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

Acute angle | An angle with a measure greater than 0 degrees and less than 90 degrees. |

Acute triangle | A triangle that has three acute angles. |

Adjacent angles | Two angles that have the same vertex, share a common side, and do not overlap. |

Angle | Two rays with common endpoint form an angle. The rays and vertex are used to name an angle below is <ABC. |

Arc | A curved line part of a circle. An arc is part of the circumference of a circle. |

Asymmetry | An irregularity or imbalance in the spatial pattern or shape or arrangement of an object or figure. |

Center of a circle | A point inside the circle and is at an equal distance from all of the points on its circumference. |

Center of rotation | A fixed point around which shapes move in a circular motion to a new position. |

Central angle | An angle whose vertex is the center of a circle and whose side intersect the circle. |

Chord | A segment with endpoints that are on a circle. |

Circle | the set of all points in a plane that are the same distance from a given point called the center. |

Complementary angles | Two angles are complementary if the sum of their measures is 90 degrees |

Congruent | Line segments that have the same length, or angles that have the same measure, or figures that have the same size and shape. |

Corresponding angles | Angles that have the same position on two different parallel line cut by a transversal. In figure,<1 and <5, <2 and<6, <7, <4 and <8 are corresponding angle. |

Diameter | The distance across a circle through its center. |

Equilateral triangle | A triangle with all sides congruent. |

Image | Every corresponding point on a figure after its transformation. |

Isosceles triangle | A triangle that has at least two congruent sides. |

Line | A never ending straight path. |

Line of reflection | The line that is reflected over in a reflection. |

Line of symmetry | Each half of a figure is a mirror image of the other half when a line of symmetry is drawn. |

Line segment | Part of a line containing two endpoint and all the points between them. |

Line symmetry | |

Obtuse angle | An angle with a measure greater than 90 degrees but less than 180 degrees. |

Obtuse triangle | |

Parallel lines |

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