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# Ch.1-6 Definitions

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

undefined terms | point, line,plane |

adjacent angles | nonoverlapping angles that share a vertex and side |

counterexample | an example that meets the definition but isn't what it's describing |

skew lines | non-coplanar lines that don't intersect |

vertical angles | non adjacent angles formed by intersecting lines |

polygon | a closed figure in a plane, connecting line segments endpt. to endpt., each segment intersects two others |

quad. | 4 sided polygon with atleast one pair of congruent sides |

undecagon | 11 sided polygon |

regular polygon | all angles and sides congruent |

right triangle | triangle with one right angle |

acute triangle | all angles are acute |

obtuse triangle | only one obtuse angle |

isc. triangle | atleast 2 congruent sides |

trapezoid | quadrilateral w/ exactly one pair of parallel lines |

isc. trapezoid | non parallel sides are congruent |

kite | quad with 2 pairs of consecutive congruent sides |

parallelogram | quad. with both pairs of sides parallel |

rhombus | pgram w/ all congruent sides |

rectangle | pgram w/ 4 right angles |

square | pgram w/ 4 right angles & all congruent sides |

circle | set of pts on a plane that have a radius & a center pt |

congruent circles | same radius |

concentric circles | circles that share the same center |

minor arc | arc smaller than a semicircle |

major arc | arc bigger than a semicircle |

geometry | a way to measure earth |

inductive reasoning | based on experience |

deductive reasoning | based on rules |

transversal | line that intersects parallel lines |

incenter | the pt of concurrency for angle bisectors of an triangle |

circumcenter | the pt. of concurrency for perpendicular bisectors of a triangle |

Centroid | center of gravity, pt. of concurrency for 3 medians |

arc length | distance from one endpoint of an arc to the other endpoint of the arc |

isometric | drawing that shows 3 sides of an object in one view |

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VaLeRiA!