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# Math Vocabulary 123

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

Angle Bisector | A ray that divides a given angle into two congruent angles, each half the size of the given angle. |

Chord | A segment whose endpoints are in the circle. |

Acute Triangle | A triangle with three acute angles |

Adjacent Angles | Two angles that share a vertex and a side but no points in there interiors. |

Circle | The set of all points in a plane that are equidistant from a given point, called the center. |

Congruent Polygons | Have congruent corresponding sides and congruent corresponding angles. |

Hexagon | A polygon with six sides. |

Isosceles Triangle | A triangle with at least two congruent sides. |

Parallelogram | A quadrilateral with both opposite sides parallel. |

Pentagon | A polygon with five sides. |

Perpendicular Bisector | A line, segment, or ray that is perpendicular to a segment at its midpoint. |

Plane | A flat surface that has no thickness and extends without end in the direction of all the lines it contains. |

Polygon | A closed plane figure with at least three sides. |

Ray | A part of a line that has exactly one endpoint. The endpoint is named first. |

Scalene Triangle | A triangle with no congruent sides. |

Segment Bisector | A line, segment, or ray that separates a segment into two congruent segments. |

Trapezoid | A quadrilateral with exactly one pair of parallel sides. |

Vertex | The meeting point of two rays. |

Vertical Angles | Angles formed by two intersecting lines, and are opposite of each other and are congruent. |

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