Geometry Chapter 1 Section 1 Notes Name ___________________________________ 1.1 Identifying Points, Lines, and Planes 1. Warm Up (Review of old stuff. You should be doing this as the bell rings and have homework out so I can check it): 1. Sketch a line labeled AB 2. Sketch a segment labeled CD 3.Sketch a line XY intersecting segment MN at point K. 2. Review Homework 3. New Lesson: 1.1 Identifying Points, Lines, and Planes New Vocabulary: 1. Point: A point has ________ dimension. It is represented by a _____________. 2. Line: A line has ____________ dimension. It is represented by a ______________ with two arrowheads, but extends without end. **Through any _________ points, there is exactly ___________ line. You can use any _________ points on a line to name it. 3. Plane: A plane has ______________dimensions. It is represented by a shape that looks like a floor or a wall, but it extends without end. **Through any ______________ points not on the same line, there is exactly ________ plane. You can use _____________ points that are not all on the same line to name a plane. Example 1: ** ** More New Vocabulary: Segment: The line segment AB, or segment AB (written as ________) consists of endpoints A and B and all points on AB that are ________________ A and B. **Note that AB can also ne named __________. Ray: The ray AB (written as _________) consists of the endpoint A and all the points on AB that lie on the same side of _______ as _______. **Note that AB and BA are ___________________ rays. Example 2: ** ** Example 3: Intersections on points, lines and planes. a. Name the intersections of line a and line XY . b. Name the intersection of MX and line a. c. Name the intersection of plane C and plane D.