1. Building Blocks of Geometry
Points, Lines and Planes
Oh my… 

2. Figure
Named by
Represented by
Example
Point
(position)
Capital Letter
Dot
Line
(no thickness,
straight, extends forever)
Two Points on the line OR
Lower Case Letter
Line with two arrowheads
Plane
(flat, extends forever)
Three Points on the plane OR
Script capital letter
Quadrilateral
Segment
(part of a line,
has endpts,
specific length)
Endpoints
Line with two dots
Ray
extends infinitely in 1 direction.
Endpoint and one other point on the line.
Line with one dot and one arrowhead

3. Other Vocabulary Collinear points Coplanar points Opposite rays
Points that lie on the same line
Coplanar points
Points that lie on the same plane
Opposite rays
Rays that share a point and extend in opposite directions

4. Other Vocabulary Intersection Parallel Lines Perpendicular Lines
If two figures have one or more points in common
Parallel Lines
Lines that never intersect because they have the same slope
Perpendicular Lines
Lines that intersect at a 90º angle because their slopes are opposite reciprocals

5. Other Vocabulary
ACUTE
OBTUSE
RIGHT
STRAIGHT

6. Other Vocabulary
What kind of units would we us to measure the length of a segment?

7. Fill in the Blank! point. line. line. plane. is in the plane.
The intersection of two lines is a
The intersection of two planes is a
Through any two points there is exactly one
Through any three noncollinear points there is exactly one
If two points are in a plane, then the line containing them
Point
point.
line.
Line
line.
plane. N
is in the plane. M

8. Handout: ½ sheet AND Blue Workbook p.1 #1-17 all
Assignment
Handout: ½ sheet AND Blue Workbook p.1 #1-17 all