front 1 Point | back 1 A point is a location. It has neither shape nor size. |
front 2 Line | back 2 A line is made up of points and has no thickness or width. There is exactly one line through any two points. |
front 3 Plane | back 3 A plane is a flat surface made up of points that extends infinitely in all directions. There is exactly one plane through any three points on the same line. |
front 4 Collinear points | back 4 Points that lie on the same line. Noncollinear points do not lie on the same line. |
front 5 Coplanar points | back 5 Points that lie in the same plane. Noncoplanar points do not lie on the same plane. |
front 6 Intersection | back 6 The intersection of two or more geometric figures is the points they have in common. Two lines intersect in a point. Lines can intersect planes, and planes can intersect each other. Planes intersect in a line. |
front 7 Definitions/defined terms | back 7 Definitions or defined terms are explained using undefined terms and/or other defined terms. |
front 8 Space | back 8 Space is defined as a boundless, three-dimensional set of points. Space can contain lines and planes. |
front 9 Line segment | back 9 A measurable part of a line that consists of two points, called endpoints, and all of the points between them. |
front 10 Between/Betweeness of points | back 10 For any two points A and B on a line, there is another point C between A and B if and only if A, C, and B are collinear and AC + CB = AB |
front 11 Congruent | back 11 Having the same measure |
front 12 Ridgid transformation | back 12 A transformation in which the position of the image may differ from that of the preimage, but the two figures remain congruent. |
front 13 Congruent segments | back 13 Two segments with the same measure |
front 14 Constructions | back 14 A method of creating geometric figures without the benefit of measuring tools. Generally, only a pencil, straightedge, and compass are used. |
front 15 Distance | back 15 The length of the segment between two points |
front 16 Irrational number | back 16 A number that cannot be expressed as a terminating or repeating decimal. |
front 17 Midpoint | back 17 The point on a segment exactly halfway between the endpoints of the segment. |
front 18 Segment bisector | back 18 A segment, line, or plane that intersects a segment at its midpoint. |