1. Understanding Points, 1-1 Lines, and Planes Warm Up
Holt Geometry
Warm Up
Lesson Presentation
Lesson Quiz
Holt McDougal Geometry

2. Warm Up 1. x ≥ 3 2. 2 ≤ x ≤ 6 3. x < 1 OR x > 0
Graph each inequality.
1. x ≥ 3
2. 2 ≤ x ≤ 6
3. x < 1 OR x > 0 -2 2 4 2 4 6 1

3. What’s the Point of Geometry?
Euclid Biography
1:30
What’s the Point of Geometry?
3:19

4. Objectives
Identify, name, and draw points, lines, segments, and planes.

5. Vocabulary
point
line
plane
collinear
coplanar
line segment

10. Example 1: Naming Points, Lines, and Planes
A. Name four coplanar points.
A, B, C, D
B. Name three lines.
Possible answer: AE, BE, CE

12. Example 3B
Name a plane that contains three noncollinear points.
Possible answer: plane GHF

13. Example 4A: Representing Intersections
A. Sketch two lines intersecting in exactly one point.
B. Sketch a figure that shows a line that lies in a plane.

19. Example 4B
Sketch a figure that shows two lines intersect in one point in a plane, but only one of the lines lies in the plane.

20. Lesson Quiz
1. A point on BC.
Possible answer: D
2. The intersection of plane N and plane T.
Possible answer: BD
3. A plane containing E, D, and B.
Plane T

21. Lesson Quiz
Draw the following.
1. a line intersecting a plane at one point

22. Homework Finish handout, then p. 9-11 #13-16, 31-34, 39-40