Points, Segments, Lines, Angles, and Planes
C.1.2.1 : Identify, describe and/or label parallel, perpendicular or intersecting lines.
C.1.2.2 :Identify, draw and/or label points, planes, lines, line segments ,rays, angles, and vertices.
Essential Questions
• What are the characteristics of points, lines, line segments, rays, and planes?
• Where can we find examples of these in daily life?
• How can we use this information in daily life?
Point
A point is like a dot, and is named by one letter.
Tip of a pencil
M
Line
A line is an infinite set of points that expand in both directions.
Pretend this line of cars will go on forever.
A
B
n
Line Segment
A line segment is part of a line, defined by two endpoints.
C
D
Ray
A ray is part of a line with one endpoint. It extends infinitely in one direction.
D
C
Plane
A plane is the set of all points that form a flat surface. It extends in all directions infinitely.
Intersecting Lines
Two or more lines that meet at a point.
AB and CD intersect at point F.
F
Perpendicular Lines
Two lines that intersect and form RIGHT angles.
AB CD
Assignment Coach pages 151-153
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