Investigating Geometry with GeoGebra

Henrico County Public Schools

Finding the Area of a Triangle 1

READ the instruction below and INTERACT with the GeoGebra applet on the right.

  1. Move the points A, B, and C, to make a new triangle. Next move the red and green points.

  2. What shape is formed?

  3. How do you find the area of the shaded figure?

  4. Move the blue points to form a different triangle.

  5. How is the area of a triangle related to the area of the formed figure?
    Is this always true for any figure? Why?
Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and activated. (click here to install Java now)