Investigating Geometry: Fundamentals

Henrico County Public Schools

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May 2006

Lesson 1-2: Segments and Rays

Interactive Applet
Video Lecture

Objective:

The student will be able to define segment, ray, opposite rays, congruent, midpoint, bisect, length and postulate. The "Ruler Postulate" and "Segment Addition Postulate" will be introduced.

 Applet Directions 1 Close 
  1. Construct segment EF so that AB + CD = EF.

  2. Using the cirlce tool , construct a circle with radius AB and center E.
 Applet Directions 2 Close 
  1. Using the intersection tool , click on the intersection of the circle with the dotted ray.

  2. Construct a second circle with radius CD and center on the intersection found in step 1.

  3. Construct a line segment from point E to the intersection of the dotted line and the second circle.

  Hands-On Activity Close 
  1. Create a Midpoint
  2. Estimating Segments (PDF)
  3. Measuring with a Ruler (PDF)
 Puzzle & Problems tangram Close 
  1. Billiards
  Other Web Sites Close 
  1. General Terminolgy Math.com: Steps 1 through 3 (1-First Glance, 2-In Depth, 3-Examples) are similar to a textbook while step 4 (Workout) is an online multiple choice "quiz" with instant feedback.
  2. Glencoe: On Line Quiz