1 1 Understanding Points Lines and Planes Objectives

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

1 -1 Understanding Points, Lines, and Planes Vocabulary undefined term line collinear segment ray postulate Holt Mc. Dougal Geometry point plane coplanar endpoint opposite rays

1 -1 Understanding Points, Lines, and Planes The most basic figures in geometry are undefined terms, which cannot be defined by using other figures. The undefined terms point, line, and plane are the building blocks of geometry. Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Directions: In pencil With your partner, fill out any of the definitions, how to name, and examples that you already know See what you remember! Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Term Definition Point Line Plane Holt Mc. Dougal Geometry Name Diagram

1 -1 Understanding Points, Lines, and Planes Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Points that lie on the same line are collinear. K, L, and M are collinear. K, L, and N are noncollinear. Points that lie on the same plane are coplanar. Otherwise they are noncoplanar. K L M N Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes 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 Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Check It Out! Example 1 Use the diagram to name two planes. Possible answer: Plane R and plane ABC. Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Term Segment Endpoint Ray Opposite Rays Holt Mc. Dougal Geometry Definition Name Diagram

1 -1 Understanding Points, Lines, and Planes Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Example 2: Drawing Segments and Rays Draw and label each of the following. A. a segment with endpoints M and N. N M B. opposite rays with a common endpoint T. T Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Check It Out! Example 1 Draw and label a ray with endpoint M that contains N. M Holt Mc. Dougal Geometry N

1 -1 Understanding Points, Lines, and Planes Check it out: Example 2 Name three collinear points Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Check it out: Example 4 Name a plane from the figure below Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Check it out: Example 5 Name two rays from the figure below Holt Mc. Dougal Geometry

1 -1 Understanding Points, Lines, and Planes Independent Practice: Textbook pg 9 #3 -8 Homework: Textbook pg 9& 10 #13 -17, 31 -34 • Draw diagrams in your homework • Write down original problems Holt Mc. Dougal Geometry