Investigating Geometry: Polygons

Henrico County Public Schools

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May 2006

Lesson 3-1: Triangle Fundamentals

Interactive Applet
Video Lecture

Objective:

The student will be able to describe triangles based on their angles and sides. The student will also be able to determine the measures of interior and exterior angles of triangles.

 Applet Directions 1 Close 
  1. In the figure, the line is parallel to base of the triangle.

  2. Drag points B and C. What happens to the angle measures?

  3. Drag either point to cover the other, what is the sum of the angles along the horizontal line?.

  4. What conclusion can you make about the sum of the angles of a triangle?

 Hands-On Activities Close 
  1. Investigate Interior Angle Sums 1
  2. Investigate Interior Angle Sums 2
  3. Angle Theorems

  4. Median & Altitude (PDF)
  5. Triangle Sum (PDF)
  6. Special Segments of Triangles (PDF)
  Other Web Sites web Close 
    Glencoe Online Quiz
  1. Classify Triangles
  2. Angles of Triangles
 Puzzles & Problems tangram Close 
  1. Medians, Centroid and Areas
  2. Orthocenter