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# Geometry honors Ch 1

### Geometry Ch 1

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

Definition of Degree | Unit of measure for angles |

Acute angle | An angle measuring more than 0 and less than 90 degrees |

Right angle | An angle measuring 90 |

Obtuse angle | An angle measuring more than 90 but less than 180 |

Straight angle | An angle that is 180 |

Things you should assume | Straight lines and angles Collinearity of points Betweenness of points Relative positions of points |

Things you should not assume | Right angles Congruent segments Congruet angles Relative sizes of segments & angles |

Def of Theorem | Mathematical statement that can be proven |

Segment bisector | a point, segment, or line that deivides a segment into 2 congruent segments |

Midpnt | Bisection pnt of segment |

Deductive Structure | a system of thought in which conclusions are justifies by means of previously assumed or proved statements (theorems) |

Postulate | an unproved assumption |

Conditional Statement | "If p, Then q" |

Converse | Switch if and then statements |

inverse | negate(if not p, then not q) |

Contrapositive | Negative and switch (if not q, then not p) |

If the angles are congruent to the same angle... | They are congruent to each other |

If angles are congruent to congruent angles... | they are congruent to each other |

Def Opp. Rays | Two rays with a common endpnt. that form a line. |

vertical angles are... | congruent |

Def of median of triangle | line segment drawn from any vertex of the triangle to the midpnt of the opposite side. |

Def. of Altitude | drawn from any vertex of the triangle to the opposite side and its perpendicular to that side. |

Auxiliary lines | additional lines or segments that dont appear in the original diagram |

Two points determine a... | line |

CPCTC | Corrosponding parts of congruent triangles are congruent |

all radii are | congruent |

slide | moving a figure without changing its position |

scalene triangle | triangle with no congruent sides |

Isos. Triangle | Triangle with at least 2 congruent sides |

HL Postulate | If the Hypotenuse and the leg of one triangle are congruent to the hypotenuse and corrosponding leg of another triangle, the triangles are congruent. |

Created by:
nickbeeler