1.1: Points, Lines, and Planes Flashcards
Concepts are so basic that it is impossible to write a definition that does not refer to the term being defined.
Undefined Terms
What names a location and has no dimension.
A Point
What names a straight path of points in a plane. Has no width or thickness, and continues forever in one dimension.
A Line
What is a flat surface that has no thickness and extends forever in two dimensions.
A Plane
What is a point at the end of a segment or the starting point of a ray
A Endpoint
What is part of a line that starts at an endpoint and extends forever in one direction.
A Ray
What is part of a line consisting of two points and all points between them.
A Line Segment
The amount of space in between two things
The Distance
What is lying on the same straight line.
Collinear
What lies in the same plane.
Coplanar
What is a statement that is accepted as true without proof.
A Postulate
What is identical in shape and size or two segments that have the same length.
Congruent
What is used when a line segment or an angle is divided into two equal parts.
A Bisect
What is the point that bisects the segment into two congruent segments.
A Midpoint
