 # 1 1 Understanding Points Lines and Planes Complete

• Slides: 14 1 -1 Understanding Points, Lines, and Planes Complete the DO Now problems and check the answers of your HW Pg 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, Holt Mc. Dougal Geometry 34: S 1 -1 Understanding Points, Lines, and Planes Objectives Identify, name, and draw points, lines, segments, rays, and planes. Understand postulates about points, lines, and planes. Holt Mc. Dougal 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 Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Postulate: 1. 1. 1. 2 1. 1. 3 Holt Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Check It Out! Example 1 Name a plane that contains three noncollinear points. Possible answer: plane GHF Holt Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Holt Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Note Example 3 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 Mc. Dougal 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 Mc. Dougal 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 Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Exit Ticket: Part I 1. Two opposite rays. 2. A point on BC. 3. The intersection of plane N and plane T. 4. A plane containing E, D, and B. Holt Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Exit Ticket: Part II Draw each of the following. 5. a line intersecting a plane at one point 6. a ray with endpoint P that passes through Q Holt Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Exit Ticket: Part 1 Answers 1. Two opposite rays. CB and CD 2. A point on BC. Possible answer: D 3. The intersection of plane N and plane T. Possible answer: BD 4. A plane containing E, D, and B. Plane T Holt Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes Exit Ticket: Part II Answers Draw each of the following. 5. a line intersecting a plane at one point 6. a ray with endpoint P that passes through Q Holt Mc. Dougal Geometry 1 -1 Understanding Points, Lines, and Planes 1. 1 Extra day practice: Exit Ticket and Practice B Holt Mc. Dougal Geometry