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# Geo.H. Chapter 2 Voc

### Geometry Honors: Chapter 2 Vocabulary

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

3 undefined terms | point, plane, line |

basic unit of geometry; indicates location; infinately small; labek with a capital letter | point |

straight arrangement of points which is infinate in length; no end points; label with points | line |

flat surface; infinate length and width | plane |

statement that explains the meaning of a word; places a word in a large group but identifies its unique characteristics | definations |

set of all points | space |

points that lie on the same line | collinear points |

points that lie on the same plane | coplaner |

straight arrangemen of points with 2 endpoints; name with 2 endpoints | segment |

distance between endpoints | length of a segment |

straight arrangement of points with 1 endpoint; name with endpoint | ray |

2 rays that share a common endpoint | angle |

degree of rotation between the 2 rays, between 0 and 180 degrees | measure of an angle |

the instrument used to measure an angle | protractor |

figures that are the same size and the same shape | congruent figures |

segments that have the same length | congruent segments |

angles that have the same measure | congruent angles |

a polygon with 3 sides | triangle |

"if-then" definition; ex; if a polygon is a triangle- then it has 3 sides | biconditional definition |

swithes "if then" definitions; ex: if a polygon has 3 sides, then it is a triangle | converse |

an angle that measures 90 degrees | Right Angle |

an angle thats measurement is less than 90 degrees and greater thatn o degrees | Acute Angle |

an angle thats measurement is greater thatn 90 degrees and less than 180 degrees | obtuse angle |

the point on a segment that is the same distance from each endpoint | midpoint of a segment |

a ray that begins at the vertex and divides the angle's measure in half | angle bisector |

coplaner lines that do not intersect | parallel lines |

lines that intersect to form a 90 degree angle | perpendicular lines |

2 angles whose measurements add to 90 degrees | pair of complementary angles |

two angles whose measurements add to 180 degrees | pair of supplementary angles |

a pair of intersecting lines that share a common vertex but are non-adjacent | vertical angles |

a pair of adjacent angles that form a linear pair; they share a common and a common side | Linear pair of angles |

closed figures; made ip of segments; named by number of sides | polygons |

# of sides = # of vertices = # of _____ | angles |

sides of polygons are _______ | segments |

________ is a point where 2 sides meet | vertex |

sum of all sides of a polygon | perimeter |

in a polygon, consecutive sides share a common____. | vertex |

In a polygon, consecutive angles share a common ________. | side |

polygons with corresponding sides and corresponding angles | congruent polygons |

a segment connecting non-adjacent vertises | diagonal of a polygon |

polygons whose sides have the same measure | equilateral polygons |

polygons whose angles have the same measure | equiangular polygons |

polygon that is both equilateral and equiangular | regular polygon |

polygon with 3 sides | triangle |

polygom with 4 sides | quadrilateral |

polygon with 5 sides | pentagon |

polygon with 6 sides | hexagon |

polygon with 7 sides | heptagon |

polygon with 8 sides | octagon |

polygon with 9 sides | nonagon |

polygon with 10 sides | decagon |

polygon with 11 sides | undecagon |

polygon with 12 sides | dodecagon |

triangle with one right angle | right triangle |

triangle with all 3 angles less tthan 90 degrees | acute triangle |

triangle with 1 obtuse angle | obtuse angle |

to have a single point of intersection | concurrent |

trianle with no equal sides | scalene triangles |

triangle with at least 2 congruent sides | isosceles |

angle formed by 2 sides of equal length | vertex angle |

side opposite a vertex angle | base |

angles at the endpoint of base | base angle |

segment from an vertex to the midpoint of opposite side | median |

segment from a vertex perpendicular to the opposite side | altitude |

A quadrilateral with 1 pair of opposite parallel | Trapezoids |

A quadrilateral with 2 pairs of adjacent and congruent sides | Kite |

Quadrilateras with 2 pairs of opposite sides parallel | Parallelograms |

An equilateral parallelogram | Rhombus |

A parallelogram that is eguiangular | Rectangles |

A regular parallelogram; an equiangular rhombus; an equilateral rectangle | Square |