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Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Complete the DO Now problems
and check the answers of your HWPg 9-10
13: B, E, A
14: Possible answer B,C.D.E
15: Possible answer: Plane ABC
16-17 see drawing at board
31: A, 32: N, 33: A, 34: S
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Identify, name, and draw points, lines, segments, rays, and planes.
Understand postulates about points, lines, and planes.
Objectives
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
A postulate is a statement that is accepted as true without proof.
Postulates about points, lines, and planes help describe
geometric properties.
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Postulate:
1.1.1
1.1.2
1.1.3
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Name a plane that contains three noncollinear points.
Check It Out! Example 1
Possible answer: plane GHF
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Note Example3 and Challenge Directions: 10 min (in groups of approx. 4)
1.Illustrate your postulate by drawing a model
**Use a dashed line to show the hidden parts of any figure that you are drawing. A dashed line will indicate the part of the figure that is not seen.
2. Illustrate your postulate by creating a physical model
Be ready to show the class!
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Example 2: Representing Intersections
A. Sketch two lines intersecting in exactly one point.
B. Sketch a figure that shows a line that lies in a plane.
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Check It Out! Example 3
Sketch a figure that shows two lines intersect in one point in a plane, but only one of the lines lies in the plane.
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Exit Ticket: Part I
1. Two opposite rays.
3. The intersection of plane N and plane T.
4. A plane containing E, D, and B.
2. A point on BC.
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Exit Ticket: Part II
5. a line intersecting a plane at one point
6. a ray with endpoint P that passes through Q
Draw each of the following.
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Exit Ticket: Part 1 Answers
1. Two opposite rays.
3. The intersection of plane N and plane T.
4. A plane containing E, D, and B.
2. A point on BC.
CB and CD
Possible answer: D
Possible answer: BD
Plane T
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
Exit Ticket: Part II Answers
5. a line intersecting a plane at one point
6. a ray with endpoint P that passes through Q
Draw each of the following.
Holt McDougal Geometry
1-1 Understanding Points, Lines, and Planes
1.1 Extra day practice:
Exit Ticket and Practice B
