1. Activity Each group member grab a marker.
Red: draw a random point on the whiteboard and name it - Earth
Yellow: draw a random point on the whiteboard and name it - Sun
Blue: draw a random point on the whiteboard and name it - Moon
Green: draw a random point on the whiteboard and name it – Mars
Draw 4 random points on the whiteboard and label it A, B, C, D
Draw the fastest way to go from Earth to Moon, and Mars to the Sun
Look at your drawings and determine if you agree or disagree on this statement:
“A straight line is always the fastest way to go from one place to another in a 2D world”

2. Chapter 1.3 Points, Lines, and Planes
1.0 Demonstrate understanding by identifying and giving examples of undefined terms and axioms

3. What do you think this is a picture of?
Where do you think it’s located?

4. Vocabulary Space: set of all points
Example: Look at the space picture
Point: Point is a location. A point has no size
Example : .P
Line: Line is a series of points that extend in two directions without end. t B A
Line t

5. Vocabulary Collinear points: Points that lie on the same line
Naming the line:
Naming the line:

6. Example
Are points P and S collinear? Are points U and T collinear? Are points Q, S, T collinear? Are points U, P V collinear?

7. Vocabulary Plane: flat surface that has no thickness
Coplanar: Points and lines in the same plane R B C A
Naming the plane: Plane ABC or Plane R
Note: you need 3 points

8. Naming a plane
Name a plane B D A C H E G F

9. Vocabulary In geometry you will have many postulate or axioms.
Postulate or axiom: an accepted statement of fact

10. Postulate 1.1
Through any two points there is exactly one line

11. Postulate 1.2
If two lines intersect, then they intersect in exactly one point.

12. Postulate 1.3
If two planes intersect, then they intersect in exactly one line

13. Postulate 1.4
Through any three noncollinear points there is exactly one plane

15. Homework
P19 #2, 6, 9, 12, 16, 18, 20, 23, 30, 34, 35