Warm - Up Please get our your homework and start these problems on a piece of loose leaf paper. Graph each of these ordered pairs. 1.) (-2, 1) 2.) (4, 0) 3.) (3, -2) 4.) (-1, -3)

Notes 1.2 Geometry 5.0

Vocabulary Point: a point has no dimension; it is usually represented by a small dot. A

Line: a line extends in one dimension; it is usually represented by a straight line with two arrow heads to indicate that the line extends without end in two directions. line l or

Plane: a plane extends in two dimensions; it is usually represented by a shape that looks like a tabletop or wall; you must imagine that the plane extends without end. plane M or plane ABC

Collinear Points: points that lie on the same plane Coplanar Points: points that lie in the same plane

Segment: part of a line that consists of two points, called endpoints; and all points on the line that are between the endpoints. segment AB or

Ray: part of a line that consists of an initial point, and all points on the line that extend in one direction ray AB or

Opposite Rays: If C is between A and B, then and are opposite rays

Intersection: The set of points that two or more geometric figures have in common. Line ∩ Line  _________________ Line ∩ Plane  _________________ Plane ∩ Plane  _________________