1. Warm-ups
P no calculators
These problems are due in 3 min.

2. Date
Sec 1-1
Concept: Identify Points, Lines and Planes
Objectives:
Given basic concepts in Geometry, name and sketch geometric figures

3. 3-Undefined Terms in Geometry
Point
Line
Plane

4. A Point It has no dimension. It is usually represented by a small dot
Undefined. A
Label with Capital Letters

5. Line
Extends in one dimension. Usually represented by a straight line with arrows on the ends.
Undefined
A B l
Labels: AB BA l

6. Plane:
undefined
Extends in two dimensions. Usually represented by a shape that looks like a table top. A B C M
Plane M or plane ABC

7. Key Terms – you probably already know some of these…
Coplanar and Noncoplanar
Collinear and Noncollinear
Ray
Segment
Opposite ray
Intersect

8. Collinear: points that lie on the same line P I G S
Points P, I, G, and S are collinear

9. Non-Collinear: Points that do not lie on the same line O G D
Points D, O and G are noncollinear

10. Coplanar: Points that lie in the same plane G M A S H T
Points M, A, T, H, S are coplanar

11. Non -Coplanar: Points that do not lie in the same plane G A M S H T
Points G, S and H are non- coplanar

12. Line Segment:
Part of a line that consists of 2 endpoints A B
AB or BA

13. Ray:
Part of a line that consists of a point called the initial point and all points on the line that extend in one direction. A B
A is the initial point AB

14. Opposite Rays:
If C is between A and B, then CA and CB are opposite rays B C A

15. Intersect: To have one or more points in common
Intersection: The set of points that two or more geometric figures have in common

16. Example 1: L C N M P O 1. Name 3 coplanar points
2. Name 3 collinear points
3. Name 3 non-collinear points
4. Name a line segment in two different ways
5. Name a ray

17. Example 1: Cont. L C N M P O 6. Name a line in 2 ways 7. Name a point
8. Name the plane in two ways
9. What is the intersection of LO and plane C

18. Example 2: Sketch the figure described
A. A line and a plane that do not intersect

19. B. 2 planes that do not intersect and a line that intersects each plane in 1 point

20. Example 3: Determine if the point lies on the line
A. Y = x-4 A(5,1)
1 = 5-4
1=1
YES, it lies on the line
B. Y = 2x + 3 A(7, 16)
16 = 2(7) + 3
16 ≠ 17
NO, It doesn’t lie on the line

21. Example 4: Graph the inequality on the number line
Example 4: Graph the inequality on the number line. Tell whether the graph is a segment, a ray or rays, a point or a line
X>2 or x<5 2 5
Line

22. Example 5: What kind of Geometric Intersection does the photograph suggest?
The intersection of 2 lines
The intersection of a line and a plane

23. Today’s Work:
In Class:
Homework: