1. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes 1-1 Understanding Points, Lines, and Planes Holt Geometry Holt McDougal Geometry

2. 1-1 Understanding Points, Lines, and Planes Warm Up Combine Like Terms 1. -y + 3y – 6y + 12y Write in slope intercept form (solve for y) 2. 3x + 2y = 8

3. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Turn to page 6 and 7 in your book and write down the definitions for the words point, line, plane, collinear, coplanar, segment, ray, and opposite ray on the basic terms sheet.

4. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Identify, name, and draw points, lines, segments, rays, and planes. Apply basic facts about points, lines, and planes. Objectives

5. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes The most basic figures in geometry are undefined terms, which cannot be defined by using other figures.

6. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes

7. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes What term describes points K, L, and M? What terms describes points K, L, and N? M K L N

8. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Naming Points, Lines, and Planes A. Name four coplanar points. B. Name three lines. A, B, C, D Possible answer: AE, BE, CE

9. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes

10. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Drawing Segments and Rays Draw and label each of the following. A. a segment with endpoints M and N. B. opposite rays with a common endpoint T. M N T

11. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Draw and label a ray with endpoint M that contains N. MN

12. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes A postulate, or axiom, is a statement that is accepted as true without proof. Postulates about points, lines, and planes help describe geometric properties.

13. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes

14. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Name a line that passes through two points

15. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes

16. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes 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.

17. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Representing Intersections A. Sketch two lines intersecting in exactly one point. B. Sketch a figure that shows a line that lies in a plane.

18. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Sketch a figure that shows two lines intersect in one point in a plane, but only one of the lines lies in the plane.

19. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes YOU CAN DO IT!!! 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

20. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes YOU CAN DO IT!! 5. a line intersecting a plane at one point 6. a ray with endpoint P that passes through Q Draw each of the following.

21. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes