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

2. Holt Geometry 1-1 Understanding Points, Lines, and Planes Warm Up Graph each inequality. 1.What is the difference between an expression and an equation? An expression doesn’t have an equal sign. 2.Simplify: -y+12x+3y-6x 2y+6x 3. Evaluate: x+3x+7x for x=-5 -55

3. Holt 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

4. Holt Geometry 1-1 Understanding Points, Lines, and Planes NameWhat it isWhat it looks like How we name it Point Line Plane Segment ~No dimension dot Point D or D ~ One dimension Straight path that goes on forever ~ Two dimension Flat surface that extends forever Plane V or Plane RST ~ One dimension Part of a line consisting of two endpoints

5. Holt Geometry 1-1 Understanding Points, Lines, and Planes NameWhat it isWhat it looks like How we name it Ray Opposite Rays ~ One dimension Consists of one endpoint and one line Two rays with a common endpoint. Point in opposite directions. Form a straight line. Only correct answer:

6. Holt Geometry 1-1 Understanding Points, Lines, and Planes 1) Points that lie on the same line are collinear. K, L, and M are collinear. 2) Points that do not lie on the same line are non-collinear K, L, and N are non-collinear. M K L N

7. Holt Geometry 1-1 Understanding Points, Lines, and Planes 3) Points that lie on the same plane are coplanar. 4)Points that don’t lie on the same plane are non-coplanar.

8. Holt Geometry 1-1 Understanding Points, Lines, and Planes 5) Theorem- Proven to be true 6) Postulate/Axiom is a statement that is accepted as true without proof.

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

10. Holt Geometry 1-1 Understanding Points, Lines, and Planes *Should remind you of solving a system of equations*

11. Holt Geometry 1-1 Understanding Points, Lines, and Planes Think and discuss: Line(s)12345 Regions 12 2

12. Holt Geometry 1-1 Understanding Points, Lines, and Planes Think and discuss: Line(s)12345 Regions 2 1 2 3 4 4

13. Holt Geometry 1-1 Understanding Points, Lines, and Planes Think and discuss: Line(s)12345 Regions 2 47

14. Holt Geometry 1-1 Understanding Points, Lines, and Planes Think and discuss: Line(s)12345 Regions 2 4711

15. Holt Geometry 1-1 Understanding Points, Lines, and Planes Think and discuss: Line(s)12345 Regions 2 471116