Investigating Geometry: Fundamentals

Henrico County Public Schools

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May 2006

Lesson 1-3: Angles

Interactive Applet

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Objective:

The students will be able to define four types of angles (acute, right, obtuse, and straight) and will solve algebraic problems associated with them. In addition, the student will sketch these angles using computer software and/or a protractor. The students will be able to define "angle bisector" and solve problems using the "Angle Addition Postulate".

 Applet Directions 1 Close 

Two line segments can intersect at one point. What is the number of different intersections that can occur when 3 line segments intersect?

What is the number of different intersections that can occur when 4, 5, or n line segments intersect?

 Applet Directions 2 Close 

Two rays, with a common vertex form an angle. How many different angles are formed by 3 rays that share the same vertex?

How many different angles are formed by 4, 5, or n rays that share the same vertex?


  Hands-On Activities Close 
  1. Measuring Angles
  2. Reflecting Angles C.a.R.
  3. Angle Estimation (PDF)
  4. Angle Types (PDF)
  5. Reading a Protractor (PDF)
 Puzzles & Problems tangram Close 
  1. Three Triangles
  2. Train Fares
  Other Web Sites web icon Close 

Math.com Steps 1-First Glance, 2-In Depth & 3-Examples are similar to a textbook while step 4-Workout is an online multiple choice "quiz".
Classifying Angles
Coordinate Geometry

Glencoe: On Line Quiz