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

2 rays of the same line with a common endpoint and no other points in common | opposite rays |

angles that have the same measure | congruent angles |

a triangle that has 2 congruent sides | isosceles triangle |

a set of points consisting of 2 points on a line and all points on the line between these 2 points | line segment |

right triangle | a triangle that has a measure of 90 degrees |

any line or subset of a line that intersects a line segment at its midpoint | bisector |

the set of points all of which lie on a line | colinear set of points |

the absolute vaule of the difference of the coordinates of two points | distance |

a polygon hat has exactly 3 sides | triangle |

length of line segment | the distance between the end points |

the point that divides a segment into 2 congruent segments | midpoint |

a portion of a circle | arc |

a point is that is the same distance from each figure | equidistant |

the set of all points in a plane that are equidistant from a given point | circle |

a segment whose endpoints are the center and any point on a circle | radius |

a triangle where all sides are congruent | equilateral triangle |

a triangle with 3 unequal sides | scalene triangle |

a point where 2 or more straight lines or rays or segments meet | vertex |

an angle that has a measure of 180 degrees | straight angle |

an angle that has a measure greater than 0 and less than 90 degrees | acute angle |

an angle that has a measure greater than 90 and less than 180 degrees | obtuse angle |

2 lines that intersect to form right angles | perpendicular lines |

the angle formed by the legs of an isosceles triangle | vertex angle |

a segment from a vertex of a triangle to the midpoint of the opposite side | median of a triangle |

the perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side. | altitude of a triangle |

a ray that divides an angle into 2 angles that are congruent | angle bisector |

geometry