Goal  Name and sketch geometric figures.
VOCABULARY
Undefined terms
Point
Line
Plane
Defined Terms
Collinear points, Coplanar points
Line segment, endpoints
Ray
Opposite rays
Intersection
UNDEFINED TERMS
Point: A point has _____ dimension. It is represented by a _____. Notation:
Line: A line has _____ dimension. It is represented by a _____ with two arrowheads, but it extends without end. Through any _____ points, there is exactly _____ line. You can use any _____ points on a line to name it. Notation:
Plane: A plane has _____ dimensions. It is represented by a shape that looks like a floor or wall, but it extends without end.
Through any _____ points not on the same line, there is exactly _____ plane. You can use _____ points that are not all on the same line to name a plane or you can use a capitalized italic letter to name a plane. (We usually use points.)
Collinear points: Collinear points are points that
Coplanar points: Coplanar points are points that
.
.

Example 1
Name points, lines, and planes a.
Give two other names for LN . Give another name for plane Z.
Name three points that are collinear. Name four points that are coplanar.
UNDEFINED TERMS: SEGMENTS AND RAYS
Line segment: The line segment AB, or segment AB , (written as _____) consists of the endpoints A and B
AB _ A and B.
Note that AB can also be named _____.
Ray: The ray AB (written as _____) consists of the endpoint A and all points on that lie on the same side of _____ as _____.
AB
Opposite Rays: Opposite rays are rays that
Intersection: The intersection of two or more geometric figures is(are)
.
Example 2
Name segments, rays, and opposite rays a.
Give another name for VX . b.
Name all rays with endpoints W. Which of these rays are opposite?
.
The intersection of the lines in example 2 is:

Example 3
Sketch Intersections of lines and planes a.
Sketch a plane and a line that intersects the plane at more than one point. b.
Sketch a plane and a line that is in the plane. Sketch another line that intersects the line and plane at a point.
Example 4
Sketch Intersections of planes
Sketch two planes that intersect in a line.
Sketch two different lines that intersect a plane at different points.