![]() Use the Point Line Plane Foldable to take detailed notes for your interactive notebook. Draw planes, intersecting planes, opposite rays, etc. ![]() Draw intersecting lines and label them as the book does. It is important that you practice drawing the figures in your Geometry book so you understand what is being pictured. For example, in the photo above ray CD and ray CH are opposite rays forming line DH. Line segment A line segment is a connected piece of a line. Some of those portions are so special that they have their own names and symbols. If a point C lies on line AB between A and B, then ray Ca nad ray CB are opposite rays. Geometry Home Study Guides Geometry Segments Midpoints and Rays Segments Midpoints and Rays The concept of lines is straightforward, but much of geometry is concerned with portions of lines. In the image above ray GB contains point N, but ray BG does not. The letters can not be reversed or you are referring to a different ray. It begins with an endpoint and extends forever away from the endpoint in one direction, perfectly straight. The ray AB consists of the endpoint A and all points on line AB that lie on the same side of A as B. The letters can be reversed without impacting the segment to which you are referring. They can be described using the known words point, line and plane.Ī segment AB consists of the endpoints A and B and any points in between A and B on line AB. ![]() The roof could be named plane BFG, but not plane NBG. The roof in the photo above is a plane, as is the concrete wall that includes point L. To name a plane, you write the word “plane” and then list three non-collinear points. It is drawn as a shape that looks like a wall or floor, but goes on in both directions indefinitely. A ray is a shape that starts at one point and extends forever in one direction. How many lines in the image above intersect at point K?Ī Plane has two dimensions. A line can also be named by a single lower case scripted letter. You draw a mini line with two arrows above the two points when naming a line. Example: The following is a diagram of two line segments: line segment CD and line. You can use any two points on that line to name it. Help with basic geometry terms: lines, points, segments, and rays. Through any two points there is exactly one line. It is represented by a line with two arrow heads. ![]() There are numerous points labeled in the image below.Ī Line has one dimension (it goes on forever). It is represented by a dot and is labeled with a capital letter. Geometry starts with three undefined terms – words with no formal definition but with a common agreement of what they are.Ī Point is a place in space that has no dimension. BP produced meets CD produced at point E. The concepts of points, lines, planes, line segments, and rays are crucial for creating a great foundation on which to understand Geometry. In trapezium ABCD, AB is parallel to DC P and Q are the mid-points of AD and BC respectively. ![]()
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