Properties of Invariant Parallelogram

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)
iDevice icon Justification
  1. How would the applet above be used to justify the property of invariant parallelogram?
  2. For which school level (or Grade) would this exercise be appropriate?
  3. Which content area may be suitable for the exercise?

Licensed under the GNU Free Documentation License

JCA Presentation: Using GeoGebra in Secondary School Mathematics teaching