Section 1.1 Undefined Terms: Point, Line, and Plane Point - Line - Plane -
Collinear and Coplanar Points Collinear Points are points that lie on the same line. Coplanar Points are points that lie in the same plane.
Example 1
Segments and Rays Segment – A segment consists of two points, called endpoints, and all points in between. Ray – A ray consists of a point, called an endpoint, and all other points along a straight path in one direction away from the endpoint.
Opposite Rays
Example 2
Example 3
More Practice