Geometry Ch. 1 Vocab Flashcards
A location
Point
Only explained using examples and descriptions
Undefined
Made up of points and has no thickness or width
Line
A flat surface made up of points that extends indefinitely in all directions
Plane
Points that lie on the same line
Collinear
Points that lie in the same plane
Coplanar
explained using undefined terms and/or other defined terms
Definitions or define terms
A boundless, three dimensional set of all point
Space
Can be measured because it has two end points
Line segment
For any two points A and B on a line, there is another point C between A and B if and only if A, B, and C are collinear and AC+ CB= AB
Between
Segments that have the same measure
Congruent segments
Methods Of creating these figures without the benefit of measuring tools
Constructions
The length of the segment between two points as it’s endpoints
Distance
A number that cannot be expressed as a terminating or repeating decimal
Irrational number
The point halfway between the endpoints of the segment
Midpoints
Any segment, line, or plane that intersects a segment at its midpoint
Segment bisector
A point that determines exactly to rays
Opposite rays
A part of a line
Ray
A Ray that divides an angle into two congruent angles
Angle bisector
Two angles that lie in the same plane and have a common vertex and a common side, but no common interior points
Adjacent angles
A pair of adjacent angles with noncommon sides are opposite rays
Linear Pair
Two nonadjacent angles formed by two intersecting lines
Vertical angles
Two angles with measures that have a sum of 90°
Complementary angles
Two angles with measures that have a sum of 180°
Supplementary angles
Lines, segments, or rays that form right angles
Perpendicular
A closed figure formed by a finite number of coplanar segments called sides
Polygon
If any of the lines contain any point in the interior of the polygon then it is…
Concave
A polygon in which all sides are congruent
An equilateral polygon
A polygon in which all angles are congruent
Equiangular polygon
A convex polygon that is both equilateral in equiangular
Regular polygon
A solid with flat surfaces that enclose a single region of space
polyhedron
All of its faces are regular congruent polygons and all of the edges are congruent
Regular polyhedron
