1.1 - points, lines, and planes Flashcards
Most words, or terms, used in geometry are defines, but some concepts are so basic that it is impossible to write a definition that does not refer to the term being defined.
Undefined terms
A _____ names a location. It also has no dimension.
Point
A ____ names a straight path of points in a plane. It also has no width or thickness, and it continues forever in one dimension.
Line
A _____ is a flat surface. It also has no thickness and extends forever in two dimensions.
Plane
An ________ is a point at an end of a segment or the starting point of a ray.
Endpoint
A ___ is a part of a line that starts at an endpoint and extends forever in one direction.
Ray
A ____ _______ is part of a line consisting of two endpoints and all points between them.
Line segment
The _______ between two points is a measure of the length of the shortest line segment that would connect them.
Distance
Points are _________ if they lie on the same line.
Collinear
Points and lines are ________ if they lie in the same place.
Coplanar
A _________ is a statement that is accepted as true without proof.
Postulate
Two segments that have the same length are _________.
Congruent
To ______ a figure is to divide it into two congruent parts.
Bisect
The ________ of a segment is the point that bisects the segment into two congruent segments.
Midpoint
