1. Points, Lines, and Planes pg.12
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Points, Lines, and Planes pg.12
Holt Geometry
Lesson Presentation

2. Objectives (1) Identify and model points, lines, and planes.
(2) Identify coplanar points and intersecting lines and planes.
(3) Solve problems by listing the possibilities.

3. Vocabulary Points Lines Planes Coplanar 3D figure
Space: a boundless, 3D set of all points
List the possibilities: one way to recognize all the names for a given figure

5. Points that lie on the same plane are coplanar
Points that lie on the same plane are coplanar. Otherwise they are noncoplanar. M K L N

6. 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

7. Check It Out! Example 1
Use the diagram to name two planes.
Possible answer:
Plane R and plane ABC.

8. Example 2
List all the possible names for each figure
Line RS
Plane M

9. Example 3
Suppose four points on a coordinate plane are A(3,-4); B(-2,3); C(4,4); and D(0,5). Draw and label a figure showing lines AB and CD intersecting at F and a point G that is coplanar with A, B, C, D, and F, but is not contained in either line.

11. Homework
Pg.16-17(20-50E)