Investigating Geometry with GeoGebra

Henrico County Public Schools

Interior Angles 1

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

  1. Move any of the blue points to change the size or shape of the quadrilateral.

  2. What relationship exists between the opposite angles of a quadrilateral?

  3. Move the green point on the slider.

  4. What is the sum of the interior angles of this polygon?

  5. What do think is the sum of the interior angles of any polygon? Why?
Sorry, the GeoGebra Applet could not be started. Please install Java 1.4 (or later) to use this page.