Points name exact locations in space. Lines extend indefinitely in both directions without endpoints, while line segments are parts of lines with two endpoints. Rays have one endpoint and extend indefinitely in one direction. Planes are flat surfaces that continue without end, defined by at least three points within the plane. The document defines and provides examples of how to write and draw points, lines, line segments, rays, and planes.

1. Lesson 17.1 Lines and Rays

2. Point Names an exact point in space. Draw it (see left) Read it: Point A Write it: point A A

3. line A straight path that continues in both directions without end. It has no endpoints. Draw it: Read it: Line KL Write it: KL K L

4. Line Segment Part of a line. It has two endpoints and all the points between them. It is the shortest distance between two points. Draw It: Read It: line segment KL Write It: KL K L

5. Ray A ray is part of a line that has one endpoint and continues without end in one direction. Draw It: Read It: Ray KL Write It: KL K L

6. Plane A flat surface of points that continue without end in all directions. A plane is named by at least three points in the plane. Draw It: Read It: plane ABC Write It: plane ABC A B C

7. Draw Line BC Line segment PQ Point G Plane RST Line ST Ray XY

8. Draw BY BY BY Point B Point Y Plane BYU